I wouldn't worry about that too much with an OL that played in the spread option. Shoot, in our old offense, you never knew what direction the play was going to take until the QB (usually; no need on dives) called it at the line right before the snap. And, of course, the direction of the play changed the blocking assignments for the OL. Hence, Paul's complaints about missed assignments. The kind of zone blocking techniques used in a shotgun are a lot easier to master.
The pass blocking … well, imho, that's what will take a tad bit of practice. But that'll probably come around too.