I did a search that has lots of info….for your quilting question.

To add a border to a quilt top that has not been quilted, first measure down the middle of the quilt. To this figure, add the width of the border to the top and bottom for a miter corner.
Then fold the border in half, mark it with a pin; then fold it again and mark the next two folds with a pin. Find the center of the quilt top by folding it in half, matching it with the center of the border, then find the 1/4 mark, pin that, and then the other 1/4 mark and pin that. Take your first measure of the quilt in the middle, and with that mark, pin the end of the quilt to it at both ends. The left over with be used to miter the corner edge. Use this same method for the border at the ends of the quilt – the top and bottom. Once you have all the borders pinned you will have to keep dividing the quilt into sections to fit into the size of the border. That way all will be square and not have one side longer. Now if this is a quilt that is already quilted, you would use the same method but be more careful in the sewing so it does not pucker. Good luck. You should have told us if it is a quilt top only or a ready-made or finished quilt already.

I cut mine a little longer than necessary. Then I use a rotary cutter and mat to remove the excess in a straight line. Also, if you are getting bulging it may be due to stretching of the fabric. As you are sewing, the part not being stitched should either be folded behind the machine on the table, or folded in your lap in an accordion shape. This way it is not hanging down which can stretch out your fabric making the quilt bulge or curve, or putting stress on the thread possibly causing it to break. I am not being a smart aleck when I suggest this, Go to your local library and look up quilting. There are tons of books with useful tips on all sorts of techniques. I love the Singer book on machine quilting! Also, Yahoo! has a chat room called textiles which is sewing and other fabric crafts. The folks in there can often be very helpful with questions. Good luck!!!