I have tried installing solar panels myself, and I don't think I set them up right. They don't seem to be putting out as much power as I thought they would. If you're not experienced in installing solar panels, I would reccommend to leave it up to the professionals. A job that took me a few weeks to finish (including learning) could probably be done much faster.
Good luck with your installation though, it's a great investment. I'm sure we all spend way too much on pool heating