You could do what's called the "London shrink" - dampen a sheet or other large cotton cloth, then lay it on top of your wool and roll them together. Leave them for a day, then unwrap them and press the wool dry with an iron. A quicker method would be to simply iron the wool with a generous steam iron.

Even if you plan to only dry clean the items once they're finished, you should still pre-shrink them to some extent. What if you're caught out in the rain and your clothing gets wet?