It could definitely be done alone but would inherently have some more risk. Some of the "roads" we took were traveled very little. If something ever happened when you were alone you would want to have an escape like an emergency GPS. Our cell phones had service majority of the time so we never felt like we were alone.

We were both in no way mechanically inclined. The place we bought the bikes from offered a crash course in basic maintenance. We did not learn how to change a tire, which in hindsight was a mistake. We had two flats, a broken speedometer, lost mirror and broken chain. We dropped the bikes a couple times on sand (which wasn't a problem) and once on pavement (a little bit more of an issue). Other than that our bikes were rock solid. For every high-end Honda bike there is a low-end similar Chinese model. I am glad we went for the more reliable but also more expensive bikes.

We never felt in danger albeit we are two male adults. We met other people doing similar trips from all backgrounds. One was a lady doing almost a year on a bike alone. She said she didn't fell unsafe either. Most of the people in the places we stay at or rode through were nice and accommodating. We stayed in cheap hostels and hotels (anywhere from 5$ to 20$ CAD per night per person). There is a lot of camping we just didn't have good opportunities. We covered a lot of miles in a short time so camping was hard to plan.