calliper slider pin stuck

[Gromit]

Hi guys. I went to clean up my calipers and change pads today only to find that the slider pin on one of the front ones is well and truely stuck. Seals are all good and im useless at bleeding brakes and want to avoid completely take it off. Im lamped and tried abit of oil and nothing (and yes i took the 2 R clips off first). Any suggestions that avoid taking it off or paying the shop to do it?