I started with RMH and used it only for XML, WSDL &
SOAP.
I completed the "SOA using Java web services" and I thoroughly enjoyed it.
Read it slowly, if you try to read it quick, you will feel intimidated with the verbosity of the book.
After first 3 chapters, the book builds up on the stuff you already read and it becomes easier.
hope this helps...
SCDJWS 5.0, SCBCD 5.0, SCWCD 5.0, SCJP 5.0