I sew the borders together and miter the corners. If I wasn't mitering the corners I would sew them on separately.

Welcome to the board and oh, my word, what a cute doggy!!!

I also do the sides. square off, then top and bottom

works pretty well when you are doing mitered corners... just match the seams

If they are complicated I make the border, measure, and add a strip if it is too big.

I had three borders on last quilt center was flying geese so everything had to match up I had to make four separate corners in order to make everything match up properly .I put all three borders together attached to sides,then attached corners to both end borders and attached the end borders as one piece.My corner borders looked like L had geese going vertical and horizontal in order to make turn and match up, same with inner and outer border. Hope this isn't to confusing I'd post a pic but it is on it's way to be quilted.

it works well if you are mitering, otherwise you may not be happy with the result

Now that is a really cool ideal!! I will be trying that one on the quilt I am working on now, thanks a ton as I was searching for a way to make it "different" than the norm for me. ^_^

I tried sewing border 1 to border 2 and it did NOT work for me. I had to rip it apart and start over. Maybe I did it wrong but I won't be trying that again!

In order to keep your quilt square, you should measure down the middle of the quilt, either horizontal or vertical, cut two strips that measurement and sew, either the sides or top and bottom, easing the strip to fit if need be. Then measure down the middle again, including the strips just sewn on a repeat the process. This will avoid "wavy borders" which are the bane of any longarmer. You want your quilt to lie flat and be square, just sewing a strip to the edges will distort the quilt. I fixed one quilt for a lady who did this, and she had 3 extra inches on one side of her quilt, and it was only a 40 x 40! I hope this makes sense to you.
Michelle G. in El Paso