Should I recap my speakers? If so who can do it?

And just how is someone who barely knows which end of soldering iron to hold supposed to ascertain all the parameters which go into making a functional crossover?

For all but the most basic cookbook crossover, which has an extremely slim chance of being correct for the drivers, it takes sophisticated equipment, knowledge and experience to be successful.

Comments like the above are the reason there are so many egregiously awful designs extant. Designing a decent loudspeaker is many times more difficult than designing decent electronics.

I agree with you jeales.  Suggesting new drivers to a guy who wants a recap makes no sense... Also,   these speakers crossovers are more complicated than most already.  To make parts changes is really suggesting a totally new speaker. 

Just recapped some old altec model 19s with solens caps.. Its a little bright compared to what it was but there’s quite some time left before burn in. I’m quite impressed by the increased detail and bass. Best 200$ I’ve soent in a while. All done by an electrical engineer who does this as a hobby. He even 3D printed a custom mount for them. Very impressive. 

Look, if doing a remote crossover rebuild is sketchy, changing out drivers is crazy unless you have years of experience in speaker design. There are driver resonant frequencies to deal with, crossover points, and trying to incorporate circuits to deal with driver characteristics, etc. Replace the electrolytic caps preferably with the same brand, and absolutely with the same values, get some Audyn True Copper caps from Parts Express, .01uf, and by-pass everything 1uf or more in series with the drivers. I would then give them a listen. If happy, stop. If you want more, go for the mini-series resistors. As stated, in full blown, designed by a mad man, crossover going from the crappy sand cast (cemented wire wound) resistors to Mills non-inductive wire wound resistors may have unintended consequences, but I would try it and let my ears decide. I can live with less perfectly than designed crossovers, if they sound better. Imperfectly flat beats muffled sound in my system. Opinions will run the gambit, but this is mine. It's pretty simple, but simple can be good. You could also consider using RTX caps rather than the Audyn caps, I haven't tried them in speakers, but they are pretty good sounding capacitors. Some say they are bright, but they tend to pass what they get, so if you have anything in your system that is bright, they'll let you hear it. That I suppose is the final point, the better resolving the speakers, the better quality components you will need up stream! If you are not prepared to spend money on new gear up stream of your speakers, you should likely let sleeping dogs lie. Replace the electrolytic capacitors, and leave it at that. Get some old broken gear to practice your soldering on before you do ANYTHING to your crossovers. You'll want a metal sponge for cleaning your tip, and tinned tips transfer heat, so always put a small coating of solder on your tip before trying to solder or desolder anything. Not all desoldering braids are alike, use this;

https://www.amazon.com/Chemtronics-Desoldering-Braid-Chem-Wik-10-50L/dp/B0019V5MAC?SubscriptionId=AK...