I think you should just use the rented longarm to thoroughly baste the quilt for yourself, in regular thread, then take it home and fmq it there, they way you like to do. I do longarming, and you will not get good at it with only occasional practice. Unless you are planning on quilting an allover meander, you will most likely be very disappointed in your results. Most places with a long arm to rent also require you to first take a class in using it--another expense you have not figured in.