I also don't have a heat gun, so I had to use a Ziploc bag with warm water.
Still though, they make it really hard
I don't have experience with the ziploc method, but heat guns can melt solder so I'm wondering if temp was not high enough with the ziploc.
Could you say more about this? What kind of setups work well? Is this really straightforward or are there any subtleties?