you have your work cut out for you. but might I suggest a thread by DerekH on 10/26/13. Titled
Make a strop - Part 1
look under how to threads or advanced search the title above.
whats beautiful about these methods is you can build a fairly cheap strop. And when you have made one, you can lay faster working sandpaper to mull out nicks. Then hit it with compound.
I think it's important to learn how to work out a nick, by getting the tools and doing yourself.
I wouldn't be screwed if someone tossed me a sharpening stone, nicked blade & a job to do with it. No judgement just honesty.