coco help please

so im trying coco as the guy at the shop said ill never go back.... so im gonna try it with a few and im potting up to 5 gallon smart pot but do i wanna pack the coco down good or leave it a little loose?? any tips would help thanks guys!

Loose you can bust it up smaller too,watch the nutes I heard coco develops nutrient retention like too much P and K.I never saw any evidence of it but I'm becoming a light feeder in my old age...47

i like to pack it tight, it will settle a lot if too loose and the transplant might not be as sturdy.