(1) Ford radio removal tools ('bout $3 at WalMart) or make your own by fashioning some coat hanger into a pair of "U" shapes.
(2) Spot next to the wiper arm mechanism. Take off the housing. There's a how-to somewhere around here. Try a search on "firewall" to find it.
(3) Power down one side, signal down the other. Just pop up the sills and run the wire under the carpet.
BTW, for wiring
www.knukonceptz.com, great stuff for little money.