go through and read it, making very small minor edits here and there if i see any blatant mistakes i expect to miss. run it through grammarly with a lot of handholding so it dosent mussy up my hard work.
Force my beta reader to read this thing. force my friends who love me dearly to read this thing. if they can force me to read scp articles and one piece fanfiction they can read my book. this is fair and they have agreed to this fate.
Print the thing out and get out my highlighters, make myself a notebook and start writing down words i want to look up the victorian slang for. and things i intend to research further as well as any notes from my betas. take careful notes of where certain plot things are mentioned foreshadowed or things like that, so i don't forget and get mixed up or fail to foreshadow properly.
check with my friends on my notes before I begin, then go through with any changes i decide i need.
repeat step 1 again, and if all seems well, take a month long break if i can force myself to.
return and see if it holds up. show my results to my friends. see if it worked as i hoped. see if we, with clear eyes, like the newest version. if sucessful and all is well, begin publishing. if all is unwell, weep bitterly, keep going. be b r a v e about it even though i am very, very unbrave right now.