Quick LED Question
So, I evidently like Portal, and I would like to create a GLaDOS costume (regardless of gender-- she beats all other villains in my book). I would like to implement LEDs into the costume for the optic. It has been quite a while since I last used a soldering iron, and it certainly wasn't for something of this caliber, and I wanted to know a) primarily, can LEDs be soldered into a series circuit, b) can this procedure be done so that it poses no harm when I put on the helmet, and c) is there anything else I should know?
Either a direct response here or a link to an Instructable will suffice, and I thank you greatly for any help, as I truly appreciate it.