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Yes, I understand
I had the same feeling when I had to clean my first 8" Dob mirror. But believe it or not everything went fine. I took the side screws off but first marked which way the mirror is sitting. And then carefully took mirror out, together with its cell,cleaned it as described and put it back the same way I marked it. I did not have to collimate it at all after this.
I guess 8" mirror is not that big and thus less chance to move out of collimation, in fact I never had to collimate it. I have 12" now and have to collimate it more often.
You can use film canister (analog camera) as collimating tool. If you don't have one go to shopping centre or chemist where ever they develop photoes and ask for one, they have a lot of them. All you have to do is make a small hole in the centre which is already marked for you. It fits perfectly in the 1.25" but make sure you don't drop it in. You put it in just as you would put eyepiece, tighten slightly and look through the small hole.
You would follow instructions just as if you had collimating eyepiece. You might even find now before you take mirror off that your scope is not collimated.
I used this one for years before I bought laser collimator. I still use it for quick check up of collimation.
bob
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