Alright so below I have an example of incorrect and correct taping. The room was originally teal and we painted it pink. This is a spot between two window frames. The left side was done correctly and the right was not. What you have to remember when taping off your trim is to hang your tape back on your trim a little establishing a new line. If you try to put it exactly where the dividing line is between wall and trim then you may run into the problem of crooked lines from the previous painters. This was the case here. On the other hand if you have freshly painted the trim recently and have gone onto the wall with that paint then in this case you would be ok to place the tape on the dividing line between wall and trim.
