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Turn the jar over and have a look underneath. There should be a two or more notches/indents on the rim of the lid that 'lock' the lid on. Just unlatch the notches with a little tweak of a knife, spoon or whatever you have lying around. Unscrew lid. Easy.
One should be very careful using metal tools to prise of lids, if you get tiny glass splinter's in your fingers they can cause pain and annoyance for weeks
I don't think you'll find that the vacuum/low pressure inside many jars is a significant contributer to the difficulty of opening lids.
just put the jam jar in some tepid water for 5 minuntes and then turn the lid with rubber gloves on. They will give you a better grip and then you'llhave one open jar.