I think you should post your need for help on your local Craigslist. Believe me, there are plenty of guys like me out there that love to pitch in for free. I'm 53 and don't have the endurance I used to, but I sure love pitching in to help people if I get the chance.
Craigslist has a lot of bad listings, so be sure to put your neighborhood name or other local specifics in your ad so people know you are real.
Post to the "volunteers" section - and if you'd like help posting it contact me at email@example.com
and I'll be happy to write the ad and post it using my account. I just installed a double oven myself, so I know what you are facing.