Hi Tiffany! I have a little boy who turned 2 this past July. I have experienced all of these problems ans then some! Ok, on the potty training issue, try not to push it too hard. My son was doing GREAT for a while, and then he just lost interest for a while. Just recently, he's been interested again. I have tried every method of potty training, and I have found that having them (boys only) stand up and pee is SO fun to them! I started this when he would get ready to take a bath I would position him on his stool and then turn on the bath water (which always makes him pee). He LOVES going potty like a big boy now! Hope that helps a little bit!
On issue #2, I know some parents may not agree with this, but when my son started picking his nose I told him that if he picked his nose (not blew his nose, but specifically picked it), then the Boogie Monster was going to get him. i told him that the monster only liked little boys who picked their nose. Now occasionally I'll see him start to do it and all I have to say is "he's coming" and he'll stop immediately. When he sees other kids doing it he says "that's yucky and the boogie monster is going to get you." It worked for us! Good luck with both issues!