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I would only do it if you could be consistent while on vacation and have the same set up at home and away (crib in a separate room, etc).

Our LO was sleep trained about a month before we went on a two week long vacation, and his night sleep was still completely messed up because he wasn't napping on his usual schedule. So I'd say you can try to sleep train this week, but I suspect it won't make much difference.

I would sleep train now and work hard to keep your baby's schedule and sleep environment as similar as possible. We traveled right after my son was trained and he did very well but we made sure he slept in his own room with blacked out curtains, we packed his white noise machine, we shipped a Dream on Me mattress for his pack n' play, and stuck to his nap schedule during the day as much as humanly possible, even if it meant annoying my in-laws by leaving places early or hauling the PNP and mattress and noise machine with us in the car so the baby could sleep while we visited Grandma or whatever.

Definitely expect regressions when you get back, especially if there's a time change, but I'd rather have something to go back to rather than just live with terrible sleep for weeks.

I would do it. The first time we did CIO, it took about 3 nights and it was ROUGH. But after that one time, every time he started to regress and we'd have to do it again, it was shorter. And when we were on vacation, he'd sleep worse, but it was still better than the pre-CIO days.

At best you'll get a few decent nights sleep before vacation, and maybe reasonable sleep on vacation. At worst you'll get a few decent nights sleep before vacation and vacation will be no worse than if you hadn't done it.

ETA- as with all these things, sleep training isn't really a once and done thing, so you might as get the first time over with.