DH, I have that exact piece of hardware and there is a lot to say about it, all no good. Unless you have delicate hands you are going to push the primer into the holder with your fingers, no other way. So, against all instructions telling you to not touch the primer face, you will absolutely touch every last one. Next: Getting that "feel" for setting a primer is really difficult, you won't know if you have bottomed out until you flatten the primer. Next: the tool will disappear and you can't load. All of the above has happened to me.
Although many have different opinions, I like to sonic clean (don't have stainless steel tumbler yet) my brass which cleans the primer pocket. Now, clean primer pockets doesn't seem to positviely impact your shooting but I like my stuff clean before loading.
Get a Lee hand primer. Had mine for over 20 years. I know what a properly seated primer feels like.
There are other methods-RCBS has a slick one with the primers loaded into strips or bought that way.
The only advantage is it is cheap and while it is sitting ther it tends to deflect some primers from bouncing all over the place.
