ive spent the last hour or so reading about templates and havent been able to find some pretty key information about them:

first i dont see some explicit directions on how to install one. i found one i like much better than classic green on http://(sorry, site offline)

i would like to install it but i dont see step by step directions to do it, and i am dumb at the internets so im scared to just try something.

also, if i install one, will it delete my ezpages and other work i did using the default template? if so, thats worth crying man tears over :'(

any help would be very appreciated.