I say if you want to do it, then do it. If not, don't. Don't worry about what you are doing as much as how you go about it (decisive, warn her you might suck at it and tell her she is not to get upset if you f it up, have fun with it).
Just don't let her put the nail polish on you, and you will be fine lol.
Spellfire aka Mike
"Women do not like controlling men. They respect and are attracted to men who control themselves. They ultimately are repelled by men who allow themselves to be controlled." -S&A