I keep a google drive document open that I update with notes for what I need or what needs engineering on what ships, sometimes I will buy modules, leave them in the station, then travel to the engineer, summon all the "Shield generators/weapons/boosters/whatever" to the engineer I am at. Wait til they arrive, then engineer everything, the move to the next engineer and do the same... I usually engineer 2-3 ships a time like that, and then fly back and pull all the engineered modules to my home base and put them in the ships they below in. I do most of my running around in either the cutter (because it can hold the largest modules) or the Krait Phantom (cause its fun).