A very firm DRE, done with the intention of draining, or wringing out the
prostate gland, we call "Drainage." Drainage has the effect of getting rid of
built-up pus and dead cells, and shrinking the gland, relieving symptoms.
Leakage of these "caustic contents" of the prostatic acini may be one cause of
some of the sytmpoms of prostatitis. Drainage gets rid of the caustic contents,
and causes the gland to refill with blood, helping antibiotics reach disease
organisms. It can shrink the gland to the extent that symptoms go away, at
least for a while.

That about spells it out - you can do your own drainage with a stiff dildo like
object.

Prostate massage is nothing more than a DRE. Your first one should be your best
one.