One of the things to be aware of with the masks is that since the idea is for them to protect you from inhaling any contaminated water droplets they need to be either washed/sterilized or discarded after use. You also need to thoroughly wash your hands after removing them in case the mask is contaminated, and avoid touching the front of the mask while it is on. I read the other day that the virus contaminated droplets can "live" on a mask for a week so theoretically you should either discard a N95 mask after using or have a weeks supply and leave each one sit for a week or so before wearing it again. Washable masks are a good option, they don't seal as well as an N95 mask but can easily be decontaminated.
Since the N95 masks do tend to get moist inside even if they have an exhale valve the worst thing you can do is use your hand to wipe the moisture off your upper lip and face after removing the mask. Social distancing, washing hands and not touching our faces are still the best preventative measures we can take but I also believe in wearing a mask for an added layer of protection.