My hands are fairly steady but tiny components are hand to grip and my vision ain't what it used to be. My Roland GR700 is having a problem that is common in that class of synth. Juno etc. the voice chips develops erratic behavior over the years...sustained notes without cutoff...ghost noises...stuff like that. There are services to "rejuvenate" the chips but frankly I don't have the moola. Some interwebz digging found some wild-hair fixes, which I guess as it turns out is what the services eventually ended up offering. Apparently Roland coated the chips (which were hybrid) with a coating of some kind,either as insulation/protection or to hide their design. I'm supposing that after some decades they cause them to overheat since it's fine for about a minute after switching on but starts to warble etc. thereafter. The genius fix somebody stumbled upon...I guess through sheer hacking logic, was to remove the chips, bathe them in naptha overnight...then chip off the coating. Replace...calibrate...works fine thereafter. Been a long time since I did much delicate soldering..much less de-soldering. So it ain't happenin any time soon.