You can insert as high up as you can go with your finger *or* you can just insert it enough to be "in" and then "pucker" your butt so you ensure its in there. I usually try to alternate, but for your first few attempts it might be easier on your mind to just get it in, lol. I find it goes in easiest if I use it right after a hot shower. I've never had to lube it up. Also, once it's in you can go about
your regular routine, it doesn't slip out or anything, just don't fart once you've put it in or you will be in for more than you bargained for
I use mine before bed. When I wake in the morning I have gas from them and this gas must be expelled over the toilet bowl since it has a bit of oily residue. Once you've got the gas out its business as usual.