I think you could do it yourself!
I wouldn't have any idea what type of codes or regulations you might have to satisfy in your area, but I have a story similar to yours that will illustrate why I think you could accomplish the task yourself.
I needed to upgrade from overhead 100 amp service to 200 amp service, thought I could do so with just a change of transformer at the pole and a new set of heavier gauge wires from the pole to my current "gooseneck" on my house. Well, the new wires would have been too heavy for the existing structure, so I had to go underground.
The electrician took 5 weeks to get to my house, but really the only thing I needed him for was to operate his ditcher for the underground service wire, which has to be larger for 200 amp underground service than would be necessary for 200 amp overhead service.
So, it went this way--June 12 the REA set a new pole along my property line in the alley and provided me with 150' of 0000 (4/0) wire. The meter box on the pole had to be fitted with a meter capable of passing 200 amps (apparently the old one was not), so I now have a digital meter rather than one of the old type with the ring that turns as electricity goes through it. Below the meter on the box was a panel door and behind that door was a 200 amp main breaker and
TWO 200-amp capacity taps.
The electrician really did very little other than operate that ditcher and backhoe. His helper did all the sheathing of the wire with "carlon", a grey tube that provides above ground protection to the wires, put the new LB fitting on the house, and laid the new 4/0 wires into the new ditch. While the electrician was on the phone, the helper got the 4/0 wires into the panel below the meter and into the house through the LB fitting. We strung that 4/0 wire to the new service panel, the electrician did absolutely nothing more than get the wires into the correct lugs and tighten them down with a large allen wrench device. Service to the house was complete to the 200 amp inlet breaker on the service panel, I did all the transfer of wires from the old 100 amp/10 circuit breaker box to the new 200 amp/40 circuit breaker box. It was not difficult and the electrician looked at everything I did and sprinkled it with holy water.
Really, with a bit of diswashing soap (needed that to get those 3 huge wires to go through the LB fitting) I could have done everything myself except for the 106' of ditch. The electrical requirements for the wiring to the house, which were somewhat dependent on the length of the run, were worked out before hand by the electrician and the representative of the REA.
I was well prepared for the electrician when he arrived, had the old panel unbolted from the wall and hanging by the wires, still attached, and the new panel bolted in place on the wall, ready for the new service line feed.
All in all, though, even though I really did do a bunch of work on my own, the cost of the electrical upgrade (NOT counting the cost of the 52' of 6 gauge wires needed for the electrical HWOD unit or the cost of the HWOD, itself) was in the $2,000 range, and the REA only charged me $75 for the 150' of 4/0 wiring ( the difference between the cost of 150' of the smaller wire that would have been adequate had I been able to use overhead service compared to the cost of 150' of the larger wire necessary for the underground service). Had I had to pay for that 135 feet of 4/0 wire (we had 15 feet left over), who knows how much that would have run????? Expensive? I suspect so.
In the end, I felt that with the considerable research and knowledge I had pursued before I started this project, I was capable of doing all the work I did, and the electrician was quite complimentary as to the quality of my work.
I must admit, though, that at times I really was a bit skeptical, mainly over safety issues, but the electrician was absolutely thrilled when he got there to find the two 6-gauge (6/3 w/ground) circuits for the HWOD unit already pulled and the HWOD unit plumbed in and connected to the new breaker box. Apparently they don't like to do the dirty work, I didn't care, I had 5 damned weeks to get ready for them when they told me they would be there in 2 weeks
!!
I know that after watching him and what he did, I think that next time I upgrade service I will rent a ditcher (I bet I wouldn't have had to wait
5 weeks to get the ditcher delivered!!) and have a go at it myself. Our REA is quite helpful and had I been willing to tackle this by myself this first time the REA was willing to get the correct size wire to me, no need for me to hire an electrician according to them!
Dugly