What are my biggest challenges soldering is what to do when I make a mistake, unsoldering is a lot harder than soldering as it happens.I have worked out how to hold things like components and wires in place. I'm pretty sure I could use one of these consider if I could figure out how to push the button.

these are pretty cheap and work well if you can push the button.
The first thought that comes into my mind is to use a solenoid, This is not something I have used a lot, I can 3D print a spool and wind wire around it to create an electromagnet.I'm thinking of either making an AC solenoid with a high frequency to increase its effectiveness, or a DC solenoid using a magnet. At this point I am brainstorming , and looking for input from people who may have more experience in this than I do. The idea is the core? Will push the button when a foot switch is pressed.

these are pretty cheap and work well if you can push the button.
The first thought that comes into my mind is to use a solenoid, This is not something I have used a lot, I can 3D print a spool and wind wire around it to create an electromagnet.I'm thinking of either making an AC solenoid with a high frequency to increase its effectiveness, or a DC solenoid using a magnet. At this point I am brainstorming , and looking for input from people who may have more experience in this than I do. The idea is the core? Will push the button when a foot switch is pressed.