Transfer case actuator problems - help ell ease

[Catman66]

I have an E53 2005 X5, recently got the ticking noise when shutting off the engine followed by the 4x4 light, although that seems to be the only light so far. Having read all the posts on the subject I am fairly certain it is the transfer case actuator problem.

I do not have the kind of money talked about to get it repaired at a main dealer and would like to avoid replacing the whole unit if possible.

So advice needed please.

I have never really been hands on with my cars as always worried I will do more damage than good. However having read certain posts this seems like it might be a relatively simple fix, but that is what worries me. One mans easy is another mans nightmare.

Can this be carried out without ramps etc I got under the car to see last night and it seemed manageable without them?
Is it easy to remove the unit?
Once removed can I expect any fluid leakage, if so is this normal?
I was hoping to do the 180 degree turn on the cog but cannot find pics on how to do this so not sure how to do, any help or pics appreciated?
Is it easy enough to replace the whole cog, I have found plastic replacements for a fiver on eBay, if so should I be looking to do this rather than the quick fix?
If I replace the cog what sort of grease should I be putting on it before putting it all back together?
Once reassembled do I need to do any kind of reset on the system or should it be ok i.e. will the 4x4 light go off itself?
Will BMW be able to tell I have had these faults when they check the system if it is not reset?

Sorry for the mountain of questions. I am quite hands on around the house etc but car mechanics has always frightened me a little. Is this something I should be attempting by myself?

Any help or advice would be greatly appreciated?