Ok Roytheboy here you go
I did it by getting a bit of card (soft but not too soft) to slide under one side then a hard bit of plastic to lever from the other side, the card then stops the letter cutting down into the paint, it may leave the tape behind but if you rub this with your thumb it will all come off nicely, keep rolling it over to remove little bit left behind, then I used an alcohol clear to take off the last bit of residue. Be very careful and take your time and don't get distracted, the main thing to watch is the card is in place so it doesn't touch the paint.
The salesman said they had a mechanic remove letters before (obviously with out my card trick!) and took big chunks out of the paint
Don't blame me if you mess it up!😜