The Salvimar polespears are very good. They are not top of the line of course.
I think you should get a cheap, 2 meter or so one piece polespear if you will be going near home. That is what I started with, and I still have it and love it. It was an ultra cheap fiberglass special with a decent three prong tip made by trident.
I moved overseas and could not bring it, so I got a salvimar 2 meter, 2 piece polespear with a three prong and a flopper tip as a backup. It is definitely nicer than my fiberglass special, the fact that it is 2 piece does not matter, it functions very well along with being much more portable. The Salvamar three prong tip is very good too.
If you get more into it you may want to get a longer one some day. But for now I would say go two meters. It is really a nice sweet spot to teach you how to get close to fish yet not being too cumbersome.
Further, I watch these guys on youtube, and one thing i notice is good spearfisherman are NOT always good with polespears. I have learned stuff I would never have learned if I would have spearfished for 1000 years from some of these Greek guys. I mean jesus christ what do they do over there, put polespears in their hands when they are born? But I recommend NOT swimming around with the polespear cocked. That is insane! Now if you are doing that for a very specific reason, or a very specific skittish fish... ok. But, do yourself a favor, don't swim with it cocked. Relax and slowly reach back and cock it as you see a good fish, which is not always ideal but it is better than swimming around all day with a cocked pole spear haha.
As far as the difficulty, do 20 minutes of target practice on a plastic bag your first day, and you will seriously be good to go.