Next, butter a 9 or 10 inch springform pan. 
  
 
 Step 2:

Then take some foil and wrap the bottom of it. It helps if you have the extra-wide foil - the foil is to keep the water of the water bath OUT of the cake, because soggy cheesecake is bad. Either way, wrap it up the sides, then trim the edges, and don't rip it.

As evidenced by the pictures, I chose to wrap and then butter. It works either way, so long as both are done before the next step.