The price is probably about right.
How handy are you with basic tools and stuff? For $20 you can pick up a repair manual for this car at an auto parts store. It will have a chapter on basic body part R&R. Some aspects of it can be complicated and require some specialized experience/skill. But its often just plain easy too. At the very least you could look and decide its more than you want to try on your own.
Outside of special circumstances I don’t ever buy parts to take to a shop. If I had a shop, I wouldn’t install customer supplied parts for reasons noted above.