I assume that vaccine companies have a solid process for going through with clinical trials. There is always a risk of side effects from any vaccine but we do create flu vaccines every year and the process is similar. We also have good knowledge of the virus. It took 2 days to understand the genetic code of this virus compared to 2 years for the HIV virus.
I hope when there is a vaccine, world governments come together and do the right thing and ensure that old and vulnerable of society are the first ones to have access. Regardless of their country, race, beliefs.
However, the acitons of Trump don't give me great hope for that. He is already trying to buy out any vaccine so it is just for the US. Some people aren't fit to lead.