I have my nose pierced with a stud (nose screw) also. I remember in the beginning I worried about nose blowing as well. However, there's really not much to it. Be careful not to yank on the jewelry, but other than that you should be fine. I tend to put my finger directly next to the piercing when using a tissue, though don't actually hold the stud in place. Vigorous blowing can force the screw part to come out of your nostril, but the stud/shaft part should be fine. It really becomes easy after awhile, especially as the piercing heals and becomes less tender
