Ive been taking hape snuff fairly regularily for a few years. I tried at first to just snort it off the back of my hand, as with regular snuff, but because of how much drier and more finely ground it is, a lot of the powder went down my throat and even into my lungs, which didnt feel healthy. I ended up making a self-applicator, using a plastic drinking straw. This has been so effective that I only use this method now.
You need the type of straw with a bendable section. Simply bend it to the desired angle and trim the ends so that you can hold one end in your mouth while the other is in a nostril. Load the nostril end with about 1cm of snuff and send a blast of air from your cheeks into the other end. Takes a bit of practice, but really gets the goods high into your sinuses, with only a small amount overshooting.
Happy hape-ing!