Colleen,
If you cannot loosen tight fingers on the purse strings, just buy
John's book and you will have made an excellent start.

Histological & histochemical Methods [Theory & Practice]
Butterworth Hinemann. 3rd Ed. 1999 ISBN 7506 3106 6 $59.50
from Amazon.
You don't get much better theory, believe me.

Russ Allison,
Dental School
Cardiff
Wales