How so? I have a rough idea of how to go about things (change my acoustic guitar, into an electro-acoustic), but I'd like some guide/references to look at before I do so.
dont do it yourself. take it to a tech if you're planning on getting a pickup installed. This is going to involve cutting and drilling into your guitar and setting up all the wiring yourself.

Dr. Z Stangray
G&L ASAT Classic (Ron Kirn Custom T-Style coming soon! ronkirn.com)
Keeley 4 Knob Compressor
Taylor 314ce
different electronics install differently.

i suggest you find which one you want here

and read the manual for it or write to lmi for information on how to install the one you want. when i last looked, there was at least one of them didn't require drilling and fishman made one that required very little drilling.