Both of my sewing machines except the quilting bar into the side of the walking foot itself. The bernina one came with the bar when I bought the foot. It is a great foot to have and use. While sewing clothing and matching plaids or stripes it is a dream foot. It's really helpful when you have the heavy quilt layers that would tend to drag from the top. I think it is worth every penny.
I understand your fear at trying something new. I had my serger for a year before I had the nerve to use it. But, now, years later, I wonder why I waited. Be bold! You will love making your own bias trim. I make my own for almost every project that calls for some now. I made a fifties apron that had yards and yards of bias sewn into the seams. It made it special to use the companion fabric as the bias instead of the boring packaged solid that is available to buy.
Don't be afraid , you will love it! BTW ... Clover makes all sizes of the metal bias makers to help you press them perfectly.