We installed ours with the help of family members. Yea, it has some wrinkles, but for the price of labor (free) I can live with that.
Our liner is going on 5 years and is starting to show some wear, but considering we were complete novices and we had no idea of how to actually take care of it except through trial and error I don't feel so bad.
In a few years we will have to replace our liner, and again we will do it ourselves.