I too suck at hard wiring, but wanted hidden wiring. So I tucked a long cable under the headliner to the passenger door, around the door frame, down under the passenger seat, to the center console power outlet. The only wiring showing is one vertical line travelling up the passenger side of the centre console, parallel to the seat back. Of course, I can't see it from the driver's seat.
I have a V1, so a long phone cable is easily obtainable. To me, this was a very suitable solution without testing my non-existent wiring and fuse tapping skills. Hope that helps.
2011.5 E90 Dinan M3, SS II, M-DCT, EDC, M Drive. Winter setup 220M w/ 255/275 Blizzaks
Performance Mods: Dinan St.1 suspension, exhaust, intake; TTPs; BPM St.II, DCT, servo tunes
Cosmetic Mods: OEM CF splitters, mirrors, center console, spoiler; Arkym CF diffuser; LUX; tint