I havn't gone through many tutorials, but so far doing an old tutorial hasn't been an issue for me. I'm pretty familiar with where the main tools are. As long as I know the name of a tool, then I can quickly and easily find it by doing a search in the Help (F1) files.
Keep in mind that I've only done free tutorials so I can't speak for anything advanced but even still, I don't think it would be an issue for me.
Don't be satisfied with what you can do but rather strive to do the things you can't do!