How to move bath tub drain pipe

Hi all. We’re renovating a bathroom and have found the new bath tub drain needs to be closer to the wall than the current drain is. Tub drain fits left to right but the new drain is about two inches closer to the wall than the old tub. Have attached pic of the current drain. Looking for suggestions - aside from calling a plumber - as we’ve exhausted our plumbing budget on new boiler and radiators. Am I best shortening the pipe between the elbow and the pipe along the wall or cutting out part of the wall pipe and putting in a T joint with new pipe directly to P trap? Any advice simplified for a DIYer would be greatly appreciated.