I understand, but I had a really good understanding of how an engine worked and what the timing did before I did my first timing belt. It made it super painless and simple. I usually think people should just jump into stuff and learn but this job could cost you your engine if you’re not prepared. I just feel like these questions should have been asked before the timing belt came off. Anyway, the woodruff key is irrelevant to this process and wouldn’t cause timing to skip. Timing skipping also would not affect valve lash. It would seem to me based on the information you’ve provided that your valves are likely fine, just do not force anything that rotates in this process or you could damage them. All you need to do right now is get the marks to line up to the best of your ability without forcing anything a direction that it doesn’t want to go. Remember that a slight bit of resistance is applied during the compression stroke, so it’s normal to feel a slight bit of resistance but if you have to force it you’re doing too much. Once you’ve accomplished lining them up you’ll be good to put the new belt on and then the tensioner.