I've installed hardwood floors a few times over the years. The first was raw maple planks that I installed by hand (no pneumatic nailer, no compressor), just a circular saw, a drill, and a hammer and nail set. Took me almost a month to finish up, as I could only work after I got off of work or on my days off. Then came the sanding and finishing. I should have hired that part out, as I didn't know that maple doesn't take stain well, and I should have used a wood conditioner first. It came out blotchy. A good flooring crew could have knocked that out in a couple days with far better results.
I've also installed engineered prefinished hardwood which is much quicker. I'm not one to pat myself on the back but it came out damn good. I used a miter saw, a table saw, and a pneumatic nailer with a compressor, which are all part of my tool collection.
This is a great time to buy yourself some tools.