Im going to speak from experience here that adding solar to my house was fairly easy and fairly cheap. The caveat being that i did it all myself. An understanding of basic electrical concepts and watching a few videos of how to mount the panels and bingo. What would have cost me probably 30k to have a contractor do i did myself for under 7k. Modern AIO inverters are a godsend along companies like SanTan solar who have fantastic deals on batts and panels. The biggest hindrance to us all are going to be the local nimbys and code nazis.