I am currently running WordPress v3.0.3 and want to upgrade to 3.2.1. Here is the thing, I am currently using the Atahualpa v3.5.3 and would also like to upgrade to 3.6.7. However, all this talk in the forums about No custom PHP code anymore. I am concerned about just willy nilly upgrading to v3.2.1 and seeing what happens. I am worried my site will just not work anymore.
My question is this. What are your suggested upgrade steps to bring my site up-to-date?