considering a Honda Grom. Still need a motorcycle license
If you can, I recommend taking an MSF motorcycle safety class, either at Leeward CC or at one of the military bases. It's a great refresher if you rode years ago, and a good basic class for beginners. If you have a larger bike (> 500cc), the course makes the test much easier using their bikes. The county test is difficult enough on a small 200cc-ish bike. I tried on an 1100, and failed the first time. When you complete the course, they send a certificate to DMV to waive the test. They still make you pay the test fee, the bastards! But, you will not have to show up at the DVM to check in for the test, then drive over to the test location in morning traffic.
I think I paid $150 for the LCC course in 1999. Website says it's now $200. Took me 4 Saturdays, I think. Now it looks like you can get it done in 1 Thursday evening plus 2 weekend days all in the same week: Thursday classroom session 6-9pm, Sat & Sun skill sessions 7am - 3:15pm. More convenient for most, I'm sure.
I'd recommend before taking the course you stop by any DMV and pick up a motorcycle safety study booklet. It's like the driver's test study guide you buy at Longs, but it was free at most DMV locations. They might have changed, but that was my experience. Once you've studied, go back to a DMV testing location, and take the motorcycle written test. When you pass, you'll be issued a MC learner's permit. You'll need that to practice riding and to take the skills part of the course.
All in all, the class makes getting a HI MC license super easy compared to having to do it all on your own. I think it's worth the money.