Previous experience - i have done one project using web services but don't know much about it ( because most code was IDE generated ).
I used RMH (Richad monson Haefal j2ee web services book) as main study resource( Not as reference book).
I read it 3 times ( End to end reading, including appendices) + 1 times ( revise it) initially i found it RMH boring and my speed was slow and didn't understanding the many things, This was the hardest part. only later i developed interest.
By this time my whole book was already painted witn marker and pencil marks.
After first three times going through RMH + Chapter 3 Blueprint + MZ Security portion then i attempted XYZWS mock exam to check my preparation got 69%.in first attempt. After that i improved a lot. also attempted Trial version of Wizlab Then i read RMH once more(many topic twice) + Chapter 5,8 Blueprint + MZ (JAXB, JAXP, design and architecture Portion) + XYZWS (JAXB)
For Security MZ notes is best resource this topic isn't covered anywhere. i got 100% in that portion
simulaneously i was attempting XYZWS Questions got 72%, 84%, 85 % 89%, 92%. In mock most questions were straightforward. Real exam i felt little bit harder (i had to do guesswork in that) I won't compare it with SCJP But i have to put atleast 3 times effort than SCWCD 1.4(thanks to HFSJ). may be my preparation method is not shortest, but i know the things well.
A special thanks to all those who share their preparation ( Gaurav Agnihotri, Steve Lock and others). Here are their posts, they explained very well.