congrats ! ur suddenly turned into your fursona/dollsona/idealized form/whatever.
what's the worst part? what's the really annoying part you're like "well obv this is the greatest thing but i wish i had realized how annoying X would be"
(this is assuming no one is weird about you suddenly being a dog or whatever; purely "what's the worst Practical part of your impossible idealized form?)
navigating car dependent suburbia as a six inch tall sugar glider would probably be an absolute nightmare
at 5'4" the hard part would be finding clothes with room for wing flaps