I once took a class, where a student "dropped" their machine on route to the first class. She observed the class rather than participated.
I would rather use class time to try the various techniques and complete it outside of class. This allows me to create a sample and to get immediate help if I am struggling with a technique. I usually leave the class knowing I can complete it on my own time, using the sample if necessary.
I can relate that it is difficult to bring your stuff to class but for me it is worth the effort.