正解です🙂

¡Usted puede hacerlo!

Can confirm.

The book was indeed eventually delivered, but way later than the initial delivery estimate.

*fwiw

Fwtw I've had a similar issue on Amazon ordering a specialized linguistics title from a UK publisher, only this one has long been in print. ("Learner English: A Teacher's Guide to Interference and other Problems" by Cambridge University Press, 2001)

Yes. If nothing else, you could only advance by embracing the act of sounding like a blithering idiot. Repeatedly. For years. If this didn't cultivate within you a proper modicum of humility, I don't know how to help you, pal.

A practice that works for me is talking to myself in the language (out loud, though maybe softly depending on the environment). What am I doing right now, what's going on around me, how do I feel about all that. That way I'm keeping the brain working on it even when there's no conversation partner.

そうやで。

Spanish teacher friends are the best, always & ever 🙂

I would suggest SpanishDictionary.com will probably be a good deal more helpful (or at least I find it so). In the case of "to think" for instance, on the one hand it presents even more alternatives, but it also has proper example sentences that provide a better sense of the nuance of each.

An overheard conversation on the train is a code breaking challenge.