been thinking about learning an instrument

i really need a new hobby and i think learning an instrument would be super fun but the thought of it is just very daunting. i took a year of guitar when i was younger so i think that would be a good place to start since i already know some basics, but i dont own a guitar currently and the idea of spending so much on something i might not actually end up having the motivation to learn is scary. if i could somehow guarantee i would practice everyday and not get bored or burnt out i would just go ahead and buy one but i dont trust myself to not just put it aside and forget about it. im thinking maybe i should try and refresh myself on the basics and learn some more and then decide after that if i really want to buy one or if this is something i trust myself to keep learning