Replying to Removing pole grip

I know this is rediculously dumb, but how do u take off the grip to ur ski pole? do u just heat it and the glue will loosen? I got some poles the other day at this ski swap and this dude was telling me to get a size bigger than the ones that i ended up getting. i was telling him i needed smaller, so he just said buy them, then u can cut it down to ur height if u dont like it. so i was thinking, well i guess it's better to get poles that are too big and can shorten later, than get poles that are too short that i cant make longer. so i did. i went home and they were bigger than the poles i was borrowing from my dad last year, so i wass gonna cut them down to that size, but apparently they're glued on.