Looks like a good complete kit, I hope it provides what you want out of your ebike experience.
Taking just a quick look I see that there is an option of motor cut off brake levers or stick on inhibitors. If you have hydraulic brakes or even mechanical disc brakes but want to keep your stock levers the stick on inhibitors are the ones to consider requesting. Since you don't have experience working on bikes and there is no reason to hurry their "less than 1 hour" installation is optimistic, especially if you have bike specific issues like interference from a cable guide on the bottom of the bottom bracket which could interfere and need modification. Otherwise it is a reasonable time estimate if you don't hit any installation snags, or at least it was for the Tongsheng mid drive.
You might already know all of this but a couple things that may (or may not) prove helpful:
Watch a video on bottom bracket cartridge removal, it is super simple and easy but sometimes people forget that the chainring side of the cartridge has left hand threads which means that you turn clockwise to remove it. The non chainring side is standard right hand threads which means turn counterclockwise to remove.
Also take a close look at the crank arm puller that you are using. My compact puller has a round piece screwed on the end which I think is for splined cartridges, for standard square taper that disc needs to be removed. Otherwise the arm puller will only be pushing against the recessed portion of the crank arm, not the cartridge axle part.
For encouragement here is a video done by some kids who look like they have zero experience and think they are greasing a sealed cartridge but still get the job done.
If you need to remove handlebar grips that are stuck tight on the bar spraying some brake cleaner between the bar and the grip after carefully inserting a thin screwdriver to create some space should make them easy to remove but still useable.
Not sure if this is applicable to the Bafang but when installing the Tongsheng on my Dahon Jack it hung up on a burr in the bottom bracket (where there is a tapped hole for a support when the bike is folded). Even though this hole is specific to the Jack I think this hanging up is fairly commonly reported, especially with aluminum bottom brackets. I used a half rounded file to remove the burr, careful to not damage the threads at the ends of the bottom bracket. Then the motor slid right in.
You won't need a chain breaker tool in order to remove your front derailleur if your stock chain has a master link but a chain breaker is always good to have around anyway.
Maybe those who have done a mid drive install, especially those with Bafang experience, have more or better tips that might be useful.
. I did a bunch of research - loads of converted Marlins out there indeed. Thanks!
