Converting practice amp.

Now that I have a real big bass cabinet-amp on the way, I'm looking for an easy way to convert my little practice amp into a head.

I was wondering if some sort of easy tutorial already existed, or if not, what are the basic things I should think about to complete this mission?

Thankyou in advance.
Grant me the power to change what I can.
Grant me the serenity to accept what I cannot change.
Grant me the wisdom to tell the difference.

"I had a hat once.
It was a very fine hat..."
Just disconnect the speaker on your practice amp, and connect that to your cab instead. It should be fine.