This is a serious project for a DIYer. (I have done enough home restoration, where this made me cringe.)
I would take all of the doors, hardwear (if need be), trim, railings, etc. to a professional, let them strip it in a vat. You can then stain/finish prior to reinstalling, and then just some touch up.
This will be more money likely, but if your time is worth more just about anything, it is likely worth it. Either way, good luck (I am finally finishing a 4 year full renovation so I am jaded).
