Solar install

So who has experience with installing solar in a home? Im thinking about adding solar to my cabin and was wondering if it was hard to do, I would have an electrician tie it into the house but was wondering about setting up the rest of the system. Big question is if I was to buy a few panels and the racks for the roof could I put in 5 or 6 panels and then add panels over time fairly easily to spread the cost out instead of dropping $30k all at once