They don't ALL need to be replaced, and rarely fail. Generally, bleeding the lifters will renew them, since they normally just end up with pockets of air in them. You can replace them individually if one has failed, but I'd personally just replace all of them with the newer RR style lifter if I was going to do one. I'm not sure how much they cost, I think I've seen that they were $35 EA?
To pull them out the fastest, turn them a few times as you lift straight up. You shouldn't need to use pliers or anything else.
To pull them out the fastest, turn them a few times as you lift straight up. You shouldn't need to use pliers or anything else.