Plan out a Moon return and the plan goes smoothly, except I forgot parachutes.
Docking ports. Back before the days of drop pods, I used to use ridiculously complex garages. I've still got entire 2000t expeditions in orbit of planets because I can't assemble the landing equipment.
This is better off than my first gas giant mission, during my mission to Jupiter I had the same problem. The mothership slingshot past every single moon encounter, miraculously not crashing into any of them, and got yeeted out Jupiter's SOI. Its no problem cuz I can just fire some thrusters to get the ship back into Jupiter encounter, so i didn't learn my lesson the first time.
Same. Second time I went to Jupiter in an attempt to create a permanent base in Ganymede orbit. I'd barely got the first attempt in position, and the second and third, much more ambitious ones, were coming simultaneously.
The second contained the entire space station in flat pack, the third was 2x 600t fuel tanks, being pushed by the 'Flying Croissant' SDU. The station arrived fine after a very conventional direct burn. The second, I tried being cool and doing ping-pong gravity assists (not VEEGA) and ended up in an anti-clockwise orbit around Ganymede thinking 'how the fuck am I supposed to dock now' as they tore past each other at 2,000m/s relative.
I ended up burning the entire fuel supply of the SDU (a mean feat considering it's powered by ions and carries a few hundred tons of fuel) reversing the orbit, docking and then using the newly arrived fuel tanks to re-fuel the SDU that had just delivered them so it could get back the Earth orbit.