Stick to your printed checklists Ultralights. I like many, have relied in the past on memory and nowadays on the printed checklist. There are too many aircraft and too many configurations to have to rely on your memory, which has a habit of failing in accordance with Murphy's Law.
You can make it a lot easier by having your checklists readily available and convenient. BTW, if you intend going for a checkride in the US and you don't have a checklist, forget about getting off the ground.