What the enema does is it makes sure that the stones get all the way out (P&B shakes would work as well) and that the bile/toxins don't sit in your colon for more than a day. If they sit there, they get re-absorbed! :( So half your good work is spoiled.
but if you do a small flush (1/2 cup oil or less) it's not such a big deal. :) Just eat good fiber, good juice, and you should be okay.
The 5-day flush protocal may be more up your alley, you take in lots of apple juice and just a bit of oil each morning. Combining that with cleansing carrot salad and herbs may be better suited for you.