I'd suggest using a putty knife instead of a screw driver to remove the old trim, especially if you want to sell it and/or if it is wood. A putty knife will distribute the pressure making is much less likely that you mar the corners of the trim. Just a thought.
A credit car works pretty well too.
'10 335i sedan/AW/Premium/M-Sport/Steptronic/Active Steering/6FL/Logic7/Sirius/heated seats/rear fold seat/alarm/Navi/Performance Power Kit