I cannot help you with a video, but 740s and 742s are quite similar.
There is one part of the design that is a royal pain. To remove the bolt, you must remove the bolt handle. It is secured by a tiny splined pin, that has to be driven out. And has to be driven back in to reassemble. Don't remove the bolt if you can avoid it. And, of course, you must remove the barrel before the bolt can be removed.