Tough. For the best, buying a laser contract as Persephone says, rates high. But I also see a make-up lesson as being equally important and they both had to do with facial appearance. I did the make-up lesson when I first started going out and while I have played with the look some, it helped my confidence tremendously from the start.
The worst? There is a many item tie. They pretty much all were spur of the moment purchases I did when in drab and not trying things on. I might have learned my lesson by now. Maybe...