If one decides to TP, I recommend waiting until the patient is on the dry side (in the old planter)
Doing so tends to hold the root-ball dirt in tact much better than when wet. Plus, starting dry allows for the fresh TP to be thoroughly watered, which would aid in any re-hab caused by a rough TP.
Following a less-than-perfect TP, I think it's a great idea to put the plant in the dark for a little bit (couple/few hours)
It won't hurt your plant, nor cause hermies, etc. as long as you return it to it's regular routine a.s.a.p.