The analyses of tree-rings in climatic and ecologic context requires computational skills and specialized software. Here is a short list of recommended software:
dplR (Dendrochronology Program Libary package in R)
Other helpful tools available at
X-Ray film processing at company J.R. ZfP-Dienstleistungs GmbH
Lamont-Doherty Earth Observatory at Columbia University, New York, USA
The Science of tree-rings by Dr. Henry Grissino-Mayer at University of Tenessee, Knoxville, USA