i don’t know if the super smal latent buds at the start of this years growth. (you use those since they are only mm apart in hight) are mature enough in june. id be worried you’d just foce a latent bud lower on the stem to sprout.
if your in a rush you can do 2 oposite chip buds. like i did last year (and this)
see my profile picture.
or this picture
id recomend locking your thumbs and a sharp knife 
a properly sharpend carbon opinel nr5 is what i used.