I am excited for you - setting up and playing with a new tool, machine, reloaded, etc., is one of my favorite things to do! Hope you have plenty of scrap leather on hand to practice with. It took me awhile to become comfortable sewing on my 4500, and I am still amazed when I see it effortlessly punching through any type of leather I feed through it! I rarely have to adjust tensions - but that may be because I am usually sewing leather that is the same thickness, even when I change needle and thread size.
Have fun and let us know what you think after you have a chance to play with your new machine!
Gary