After I bought my ukulele, the first two things I reached for were a metronome and a notebook. The metronome is a leftover from when I studied drums and has way more functions than I need, but it does the job. I actually like working with it because it keeps me honest about maintaining a steady tempo. It also forces me to back off when I practice chord changes too quickly and create tension in my fretting hand (when I get overconfident about my speed, my forearm complains the next day–I take the hint and return to slower practicing as I diagnose what I’m doing wrong).
The notebook is a no-brainer: I use it to plan my practice sessions and track problems to solve. Over time, it’ll be a nice record of my progress, especially since improvement is so slow.
Practicing is unglamorous, sometimes boring, and almost always frustrating since I’m testing the limits of my abilities. But despite all that, I find it satisfying. It requires all of my attention and analytical skills, and I trust that with regular, deliberate practice, I’ll eventually suck less.