Pedal Removal Difficulties

I've just acquired a GT avalanche 1.0 and am most impressed, but the pedals that came with it are sketchy as hell so today I got some better pedals, but I'm having loads of trouble getting the rubbish pedals off! I presume they've been threadlocked on but it's refusing to budge. Any tips? I'm kinda new to fettling.
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I know this may be sounding a bit daft but are you trying to undo them the wrong way round ?. The side with the chain rings is a conventional right hand thread an the other side has a left hand thread. If you know this and there still not moving try soaking in wd40 or something similar .Assuming you bought from a bike shop , i would take it back to the gorilla who did them up to tight and make it there problem.
Actually, was there some note of seriousness in dhxcme's scaffold tube comment? As much as it made me chuckle I couldn't help seeing some sense in there.
I'd go for the longest quality spanner you can get on there - don't want to round off the facings, and use some penetrating oil. If you do screw it up, then it's new crankset time (easy way). Oh and do double check the direction
'07/'08 Cotic Soul
'96 Scott Vail
'89 Ridgeback Rapide 105
I have a nice two tooth scar on my left thumb knuckle from a pedal that gave suddenly when trying to undo a gorilla's work. Needless to say the chain wasn't on the largest ring... :shock:
http://www.pinkbike.com/photo/1694806/
http://www.pinkbike.com/photo/1993863/
Gone but not forgotten!:
2005 Specialized Hardrock Sport - 'Red Rocket'
stick the pedal spanner on the pedal flats.
position the cranks so that you can sit on the bike and prevent the cranks from turning with your opposite foot to the spanner side.
put one foot on the opposite pedal, other foot on the spanner.
HEAVE.
bob's your uncle.
This is a saying I've never understood...mainly because I know 4 bobs, one's fat, one's bald, one's ginger and the last is my father...but neither of those is my uncle.
Anyway, yes, erm...thanks again for tips and stuff. I had a lovely pootle around the woods in the mud, and my feet stayed where I put them...which was jolly handy!