Swapping from themeforest to studiopress

[Mister]

Hi there,

I have limited knowledge on setting up a website. However, I have been able to finally make an up and running site changing the codes of the .php files as opposed to actually using wordpress (I am a total noob).

I have been doing some research and would like to change from my current themeforest theme to using a theme with studiopress. However, due to the nature of my work, I need the site up and running the whole time. Is it possible for me to start a new studiopress themed site, work on it till I'm done, then swap it over, to minimise the down time of my site?

It is probably a stupid question for most of the forum members here, but I appreciate any help.

Thanks in advance!