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1. Do I have to go SP3 first, or just straight SP4 ?
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Straight to SP4; BES SPs are inclusive of all previous ones.
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2. Do I have to go through all the maintenance releases in order or just do the SP4 and then install the mr4 ?
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Straight to SP4 and then MR4. MRs are also inclusive of all previous ones.
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3. How easy and straigh or difficult this process ?
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Be a good Sys Admin and perform a backup of all the critical components (server & database) and then its click click click reboot done.