Ok I am telling you the procedure hope you understand
First of all you have to remove the silver rings to remove them you have to pull them front underside. The undersides come off easily and now the silver plate can move slightly now pull the same circle plate from the uppersides do only one side at a time because they are tight and require some force. When I was doing it on my car the undersides came off but the left upper corner one didnot come off at first than I pulled the upper right side one and it came off and now the entire plate was to remove. Actually there are 4 clips and the best place to remove upper ones will the two triangular places where three circles meet. Take 2 fingers and hold the plate such that the point on the plate where 2 circles are intersecting is in middle of your 2 fingers than pull it. Hope that will enable you to remove the silver circles.
As soon as you remove the circles you will see 6 screws. 2 screws are for meter and 4 are for the beige plate inside silver plates. 2 screws for the meter will not be accessible easily but the 4 screws can be unscrewed easily. Unscrew them and the beige plate will come off.
After you take off the beige plate you will see 5 more screws that are for the dome shaped roof for the speedometer. 2 screws for meter are also accessible. Unscrew all 7 screws and the dome will come off.
Now you have to unclip 2 connectors both are of different size so no need to remember to which socket they belong. Its impossible to move meter inside its case even few inches unless you unclip those connectors and the connectors are damn tight so you will have to try a lot. Once they are off the meter can be taked by slightly moving it.
Once the meter is out if you are just going for lense buffing than I think there are 7 locks that hold the lense fastened to the meter and they are hell easy to remove. Select a clip unclip and go in any sequence line wise and the lense will come off now you can buff it.
As for as opening the inside of meter I dont know because I did not do it
For doing all this you will have to move the steering in its bottom most position so make sure your adjustable function in your steering works because if it does not move you may get stuck in the middle although there is a way out you can remove the steering and do that quite easily but there are 2 problems. One you will a socket of the size that is on your wheel spanner and in the cabin it could be difficult to do that with your cars cross spanner, so you will need a proper socket. Secondly if you take it off than you will have to be very careful because steering wheel might not allign properly. By misalignment I mean to say that only steering wheels alignment will be out not of your cars so its not a big issue.
And last but not the least all of you who try this procedure please post detailed pics and before and after and also post pics of the connectors and even screws I need them