removing decals

I have the same problem as one metioned earlier in the forum
with an academy f86 kit decals. i only have one of the decals in
place and will need to remove it so i can use an after market
set.
any suggestions to do this without screwing up my finish.

First let me welcome you to FSM seeing as this is your first post here.

Here are 2 threads that cover your question pretty good.

http://www.finescale.com/fsm/community/forum/topic.asp?TOPIC_ID=2278

http://www.finescale.com/fsm/community/forum/topic.asp?TOPIC_ID=3647