I've bought through Sato, Keigo, and others 
who've acted as YJ middle men often over the last 
three years. Never once have I been hesitant to 
ask any type of question regarding cel specs. Ask 
away, ask politely, ask often, and don't ever be 
intimidated or worried that you're taking up too 
much of someone's time. Both Keigo and Sato have 
helped me numerous times with questions such as 
those you mentioned. 

You're smart to ask, you should ask, and you'll 
be a better collector for it.

And oh yeah, welcome to the game. ^_^ 
MeganD.