The topic of replacing quarter panels and skins is thoroughly covered on various sites. The autobody site is good. Also check out
www.metalshapers.org and
www.paintucation.com. Kevin Tetz of Paintucation puts out a great DIY video series for paint and body work.
Many of us do this type of stuff for ourselves. I do it all because I like it. I haven't seen pics of your car, but in general, any car that will need quarters will also need a lot of other stuff. Restoring a car is a lot like building a house. You can pay someone to do the whole job, you can be your own contractor and sub out work or you can do everything yourself. If you have the time, place, basic skills, and the inclination, you can do this all yourself. You will have to invest a good bit of money in tools. the actual work isn't that hard...it just takes a lot of time and practice to get good at it. In any event, the path you choose should map onto your goals, interests, and budget. Like I said, a car that needs quarters will generally need a whole lot more stuff done to fix problems that you don't see. I would advise against having a body shop do piece-meal repais. Instead, either find someone to do the whole restoration and get a contract in writing or plan to do the restoration yourself. Fixing the car one part at a time will only lead to problems. Get a game plan together.
Post some pics so we can see what you're dealing with!
