Ok Jonny, this is what i would do. Take a big solo cup, cut the bottom out of it. Stick it in a big pot filled with FFOF, i would forget the coco, but that is just me. Get the medium in the cup wet, plant the seed. When the seedling grows out of the cup you can just cut the sides of the solo cup down the sides with scissors and remove it without disturbing the seedling. Did that make sense? You will have to cut into the dirt so don't use your best scissors. I have done that. It works. You may have to add some more soil to the pot when you take the cup out but that is ok.