1 Coupe easiest way for sub & amp help

[jakk]

hay looking for help easiest way to wire up an amp & sub?
Ive had a look around seen a few guides for installing but wonder if there is a more basic way ?

can I just tap of the rear speakers? and amp looks easy,

dont really want to strip anything out if i can help it it only a temp thing for about 9 month untill next coupe arrives

and would this cause any problems with warranty?

thanks for any help