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So you cannot get your arm down past the secondary in the 8"? I'm sure I tightened them this way early on with my 8" and my arms arenn't particularly slender. Or maybe I did it when I had the spider and secondary out, for another reason.
If you cannot get your arm past, holding a suitable ring spanner, I suggest you remove the spider rather than removing the primary. Unless you think your primary needs a wash - then remove it instead and do two jobs.
If removing either, have a good look at the screws and spider/mirror cell positions so you can reinstall as close to the same orientation as you can. Note the "depth" of each of the four screws folding the secondary to the OTA wall and try to reproduce these on re-installation. If they are set correctly, they centre your secondary mirror accurately on the mechanical, and hopefully optical axis (if the primary is well centred in the tube).
Obviously work with the OTA horizontal to reduce any risk of dropping a tool onto the primary.
Yes, you would need to recollimate after removing either end. If it's a long way out, and it's not because the secondary mirror came loose with the handling, check all the installation and screws that nothing has gone wrong - If you put the mechanicals back together as they were, the collimation shouldn't be too far out.
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