^^^ You'll likely K-hole, which I don't recommend for your first time. I don't know about tryptamines, but I do know that K staves off tolerance to amphetamine, which is a phenethylamine.
It's profound and intriguing. I hesitate to say K is fun or euphoric, but it'll definitely keep you coming back for more just because of the 'oh wow!' factor. To put it another way, K is good like a mystery movie, rather than like a comedy.
FWIW, I never have any urge to move while K'd up. Like with indica strains of marijuana or opiates, it just feels better the less movement I attempt.