Knitting

[destinediva.livejournal.com]

Eek. I started knitting a scarf today, the go-go-garter stitch scarf from Stitch and Bitch. I left the long peices of yarn when switching threads, but then they were getting in the way. Being the impatient person that I am, I didn't want to take the time to learn how to weave them in, plus I'm lacking a yarn needle. So I tied them off and cut them short, right to the knots. Now I'm noticing that the knots are coming undone. I tied each of the several times, but I'm just wondering what I should do. Are they going to stay tied together? If they come undone, I'm not sure that the yarn will be long enough to weave in. What should I do then?
Side note: I just starting knitting, this is my first real project.