Finished my CPL & MER 3 weeks ago - it's pretty much what you will have done before but to a higher standard. Depending where you will be doing your CPL, I'd recommend flying into the same airfield several times to get used to it, fly in controlled airspace generally, visit busier airfields generally, fly with an instructor for an hour or so refreshing your manoeuvres and nav (cheaper than doing so at CPL rate), when on your own practice flying within 50 feet or a set altitude, within 10 degrees of your heading and 5 knots of supposed airspeed. Away from flying, review the local chart for where you will be going and the Pooley's for the airfield: commit as much of the local freqs etc to memory as you can. Good luck.
RD