Congratulations! I recently got the 430 and I LOVE it!
I have had trouble using the knee lift because my sewing table has an apron on it and it interferes with the lever. At some point I may get a new table, but for now I just won't use the knee lift.
I don't really have any little tricks to share yet, except for this- I was having trouble with missed stitches lately so I changed the needle and that helped.