Sign the lease for your new apartment.
Call your mom, dad, brother, and friends to gush about the adorableness of the place, which you will be living in all by yourself for the very first time. Use the word "quirky" with Dad, because using words like "adorableness" to describe housing gives him suspicious Dad-face.
Make a budget. Make a list of things you'll need to buy new for your brand new apartment. Make a list of things you'll need which are currently in communal circulation in your rental house. Make a list of things you've borrowed from friends. Make a layout of the apartment on graph paper and use tiny sticky note cut-outs to pre-arrange your furniture five different ways. Make a list of things you will need to buy or make to decorate your new bathroom like one of the tacky themed motel rooms on Supernatural.
Realize you are obsessing.
Have a cup of tea. Do some homework. Watch some TV. Avoid your lists and graph paper and bizarre decorating schemes.
...then find a retro motel wall clock on ebay.
Yeah, you're screwed.