Your native language is English? Then, if you try and find you can't read in French, it's time to be realistic about how much French you actually know. It's not possible for someone who actually does know both languages not to be able to read in it. Pure guesswork will tell a native English speaker what absurd amounts of the vocabulary means even if they've spent no time studying French, because our language is in fact mostly French. If you've done this before with other languages you remember how, right?

Then there's online dictionaries, built in ones on Kindle. Cakewalk.

Edit: Seeing you write about the passage, it's very obvious you can do it. Practice will improve speed, it'll be fine.