Vaccines will help. If they don't it's gonna be a bitch. Vaccines will contribute to herd immunity. Vaccines by themselves, if not highly effective (and apparently they aren't expected to be highly effective), will only protect you partially. IOW, if I get vaccinated and it prevents me from getting the virus 60%, I still stand a good chance of getting sick the way things stand. But if enough people get vaccinated, the spread is gonna slow dramatically. The R0 factor (the number of people infected by each person who contracts the virus) will go way down and the pandemic will be stanched. Then my chances of getting the virus become low. Not so much because I'm vaccinated (although that helps) but because the virus won't be around much.
Given these facts, if you have risk factors in particular, you should still be thoughtful and careful after getting vaccinated. As herd immunity builds (by virtue of vaccinations and immunity conferred to the populace who have survived infection) it won't be as necessary to take precautions. Hope all this makes good sense.