Hello all,
*** Sorry the post is longer that i expected... be warned !!

you can jump to the last part to get the question...

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First of i'd like to say that this site is amazing... i know it's been said before but it's so easy to complain and sometime we don't take the time to give positive feedback since we take for granted that people know about it.
So to everyone who participate on this site at all level... Keep up the good work it looks to me like a solid community of the best geeks in the world !!
Let me introduce my self a little so you know about my background exp, then it might be easier to answer my question.
31 yo Site Support Tech, working for a big Financial company that has offices all around the globe. I'm french Canadian working/living in Montreal, Qc, Canada. (that could explain some writing mistake i may do... apologize)
I've been messing around with PCs as far as i can remember but my real IT experience started in January 2008. So i'm officially Junior but as i said, i've always been able to fix my issues, building PC and gaining experience on my own with a small network of PCs i've been building for some times now (5 pc hooked together, including 1 MAC, and a linux machine)
Since i've started working there, i kept on building confidence about my knowledge and skills. My boss and her higher up keep telling me how they're impress about my skills and that i've made a big difference since i've been hired. Taps on the back are always welcome and helped me considering myself as not so junior tech.
for couple months now, certifications been growing on me, i want to officialize my status as a complete tech. They only paper i have is a professional degree that i've completed prior of getting my current job but i find it's not enough. i've always suffer of a big lack of confidence while i was studying... every exam i did i've been so nervous, always expecting to fail and always ending up having marks above 90%, my average mark for that 2 year course i took was 93%. So you may be asking yourself why the hell is he not having confidence in himself.... i don't know it's just who I am i guess.
So here come my question... finally... I'm getting prepared for the A+ exams, scheduled at the end of June. i've read Mike Myers All-in-One book 6th edition, done some practice exam with 80-90% marks lately. Althought i can't help but being nervous and doubting of my success.
I've read another thread and someone was suggesting to read more than one book to get prepared (were talking about Myers and Sybex). I don't feel going to buy another one, as i'm saving to start Net + and some MS certs after.
How do you guys know you're ready ? how do you deal with the stress of failure ? mind sharing some of your tricks ?
Thanks in advance
Cheers