Basically the title, you need to use the skills you have now and be a productive member of society.
I don’t mean go back and show the wheel or try invent germ theory etc.
For example I’m a mechanic i think I could go back to the late 1800s and still fix and repair engines and steam engines.
Maybe even take that knowledge further back and work on the first industrial machines in the late 1700s but that’s about it.
Hmm. Before the end of the 19th century you’re going to run into non-standardised/completely bespoke parts problems. How are you on a lathe, or doing blacksmith work? Hot riveting was a separate trade which you wouldn’t have to do, at least.
I’m kinda obsessed with what I call technological bootstrapping, and so I have useful book knowledge about every step along the way. Doing it in practice is another thing, though; the locals are going to run circles around me unless I can invent stuff. (And even that rule aside, not starving or being “disturbed” while I work on whatever project is a thing)
So, I think I have to echo the “it’s not going great in 2025” answer.