system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How hard is it for me to build a lightsaber and be fairly proficient at using it?

I will get this out of the way right now; I am not force sensitive. I am just a small time bounty hunter living on Tatooine. I recently came across a fair amount of credits and equipped myself with some new gadgets. As I was shopping around looking for an Echani vibroblade, I started to wonder if I could use a lightsaber instead. Now I know lightsabers are tricky to wield but I am skilled at using a vibroblade and I was wondering if it is possible I can get my hands on a lightsaber and use it for my own purposes?
gpt
If you manage to get your hands on one, then learning to use it would be hard but possible.  You probably won't be deflecting any blaster bolts, but using it as a weapon is possible without the force.  The biggest problem is it's very difficult from a regular sword, and fairly different from a vibroblade, and since you lack access to a practice blade it will be difficult for you to become proficient.  
That said, building one is near impossible without access to the closely guarded secret that is the Jedi's cave of lightsaber crystal.  The Sith have a method of making synthetic ones, but being indebted to them is a bad idea.