before you do anything-the date should of changed before 02.00 -get the date moved on to 23rd fully in window and let down the mainspring before you take the stem out
the stem will also need to be shortened (snip thread down) so when crown is fitted and pushed home that it does not touch the case. get more than one stem if you snip too much off the thread
if you look closely at the way that the watch body fits onto the carriage with the fixed rotation slot spigot one end and the holding ball bearings on closure at the other run and flip the watch body in the carriage groove and snap it shut and study it closely while doing it with a loupe x4 and you
put it over night on a watch winder in the anti clockwise direction mode-only Patek Calibre 315 Calibre 315 CCW 800 turns per day. what is the ref model number of the watch do you own?