I am a new denture wearer, upper and lower. Using denture adhesives, is there a "best" way to remove adhesives

I am a new denture wearer using both upper and lower teeth. I am trying several adhesives, but I find removing the adhesiive later is difficult. It won't separate easily from either the gums or the dentures. Is there a "best" way to remove it? Is is harmful when swallowed?