Hi Kim, Welcome to the board.
Well the LED's price depends on what color you want like red, green, or blue. If you want to get some red LED's I suggest you get them from Red Devil on this site, he sells them for really cheap. He also did my LCD and should be doing my needles one of these days if he can, I'll post pics. And yeah you can do this yourself they say it's pretty easy but it would be easier if you had someone do this that has soldered before. If your going to get them from Red Devil, he can tell you what you need. He's doing or has done his stuff in red. If your going with any other color you can get them from thehammer at www.teamcelica.com
but more expensive. You can ask Red Devil or just tell me and I'll ask him if he has any other colors. If you have any other questions just ask.