You're making this out to be a little too easy. I'm very impressed with you being able to do this without cutting. I cut mine pretty decently and after 20 minutes of trying I still couldn't get them on. It's really helpful if you use 2 hands, 1 to hold the gauge down on one side and up on the other side, and have a friend hold the needle down on the black base.
Just use caution when you do this. A cluster is very costly to replace. And yes, relax when you're doing this. I got worked up a few times and had to chill out and go do something else for a while. If you get too worked up you may try to force it.