Hello and welcome to the forums!
As you've probably already found out, open-minded skepticism is a requirement for any investigation into unknown territory. Any idea or theory which breaks new ground is likely to require the overturning of assumptions and beliefs, so open-mindedness is required or one would never be able to see beyond what was known previously. But, in order to make sure such ideas aren't just someone else's beliefs or short-sightedness, one needs skepticism to sort it all out.
Is MBT 'the way'? I wouldn't think so. Formally, it is a theory - just like Relativity, QM, String Theory, etc. Well, not just like them; but you get the idea, right? In fact, early on, I believe Tom mentions that MBT is not 'the way'. It is a description of reality (the whole thing - no, really) without leaving loopholes, paradoxes, or absolutes - science, philosophy, and metaphysics is quite a wide range of subjects to unify.
"Is is possible for anyone to experience the OBE ? An opportunity and experience like Tom Cambell's is not the norm. Is this reserved for a select few? Maybe only a few that are higher up on the learning curve, or that have experienced >n(lifetimes) are allowed? "
Yes, no, perhaps/no
The results are based on you - your intent, the quality of your consciousness, and the courage to do it (to pull yourself up by your bootstraps, as Tom would say). Everyone has the potential, though.
"Will HemiSync tapes give you a jump start ? Or do you have to 'believe' and sacrafice all to do the hard work required? "
It may help you, or it may not. Since you have the tapes, why not experiment and see if you get better results with them or with just plain old-fashioned meditation? I'm not sure if there's such a thing as a 'jump start', but perhaps there is. While results (in my experience) come from immense effort, I have not had to sacrifice anything but a few beliefs, some bad habits, and a bit of ego - and good riddance! You do not have to believe in anything to succeed (believing in less is how my progress comes), except to believe in yourself and in your ability to be more than you are now.
I wish you well on your reading and experimentation. Just remember to stop and smell the roses every so often.