Hi

I am currently running my website www.p3sa.com through blue voda.
I would like to experiment with the Soho site builder, but I want to know if I can build this website offline, and then change sites when I am ready to launch?
Can I continue as I am until this site is ready? Or is the changeover immediate?
I am weary of downloading it, until I am sure that I can continue on as I have been in the meantime.

Thanks