Use some dielectric grease. I just worked on a car that had a decent set on it but the boots were pretty much molded to the plugs. Broke a few taking them off
I like the Magnecors. They are pricey but a nice fit. I had mine for many years. Last set I cheaped out on, but they got the job done. I usually go to Autozone (thanks to that frequent shopper card and a relative that works there and hooks me up

). My ignition module, coil pack, wires, alternator, water pump, oil pump and few other things came from there. They work good on my car for some reason.