I’ve used my pop rivet dimple dies many many times. I have two sets of dies. The first ones were not very “crisp”. The newer set (now several years old) are as crisp as any dimple I’ve set with my squeezers or C-frame. I think I got them at Avery, but not sure. It’s been a while.
The way I do this solo, which is all the time, is - I tape the male die with nail in to the hole on the outside of the airplane. Then I crawl inside with my rivet puller and female die, and complete the dimple…… then crawl back out and move the male die, nail, and tape to the next hole and repeat. I can get at least three dimples with one nail and piece of tape. Other than working my senior citizen body into the proper position inside the fuselage to accomplish this, it is quite easy, and for a typical antenna doubler, only takes about 5 minutes or so. I need help to set the rivets, but that only takes a few minutes with an experienced riveter/bucker.
I’ve also used a variation of this procedure to torque nuts on fasteners on my firewall, or fuselage, such as bolts or AN bulkhead fittings. I tape an open end wrench on the bolt head or AN fitting with the wrench end bearing against something near it in the tightening direction, like a bracket or some part of the airplane. The tape is only used to hold the wrench in place so it doesn’t fall off the bolt/fitting. Gorilla tape is awesome for this and can be used over and over. Then I crawl inside with my torque wrench and tighten the nut. Hit it with a little torque seal so I know it’s been torqued.