Overdoing it yes, with the tailend effects building up and clouding the high itself upon redosing. In this sense, due to its compulsive nature it is somewhat similar to dopaminergic stimulants like amphetamines. However the similarities end there, this is a very very spiritual compound, almost mystical, just like ketamine but it moreso reminds me of MXE in some ways (methoxetamine, 3-MeO-2'-oxo-PCE, its 2-methoxyl N-ethylated counterpart)
Since its a new untested compound and many trying it tend to order online and perhaps their first experiences with dissociatives (on the sites its sold its listed alongside both rc stimulants and black market drugs), the recommended dosages tend to stray more on the conservative side so that those with no experience have perhaps a better chance of not having an overwhelming experience.
In my experience, for the more old-school type of users, its okay to eyeball this compound (small lines). Keep in mind though that it comes from some vendors as a highly compact rock form, with in some cases a small rock being over 1g. A small sorta chunky line turns into a huge one if crushed over and over until its no longer crackling upon pressing upon it with a card or what-have-you.
I would not recommend this one for IV or IM, not only is it completely unknown territory but it also could have vendor specific issues like way too acidic etc.
Good news is, it can be smoked. Its way harder to hole on this compound then ket, but the plus side with this one imo is that the most euphoric of its effects occur *after* the peak, that is, when youre lucid enough to function in reality. Strong strong afterglow with this one- to the point that it can trigger mania in some (be careful mixing with alcohol and amphetamines- it spoils the experience)