[Tilt, TyTN II, MDA Vario III General] shinydoc:
T-Mobile Vario 3 - Kaiser Screen Replacement

Well, having looked at all of the helpful advice here I decided to have a go and do it myself!

I bought the screen from EBAY (Hong Kong) for £26 and it arrived in less than a week!

Here's what you need to do...

Remove the battery and slide the cover back on again to protect the insides.

Take the 4 screws out as described elsewhere here at the very beginning of the thread with a Torx 4 screwdriver. EASY!

I then made a plastic case opener from a cut out old credit card (you can get one of those gift cards from Tesco or similar if you have shredded your card ;) ) I shaped it like half the size of your little finger. You can then insert this in between the silver (front bit) and the flat black case back [of the front sliding portion] (This is the bit that will be sandwiched when you slide it closed) DON'T push it in too far (only about 4mm max) Carefully slide it, looking with a bright light for the lugs (and spex if you need them!) to release the case. The corners are the worse, but be confident and firm and you should be fine. Once you have done one side, slide the phone shut and do the other side which will be easy now.

When it is all released DON'T pull it apart!!!!! Be very careful for the rest of the procedure!

Approximately behind where the green (make a call) key is there is a narrow ribbon that you can carefully prise off (It pops off extremely easy) with some long tweezers. You can now open that edge of the screen a little more (no more than about a cm), not forcefully though.

You will be able to see the screen connector now (it was under the ribbon you just removed) prise this off with some tweezers, push the screen carefully from the front and slide it out CAREFULLY and SLOWLY from inside (Be careful of the ribbon cables on the other edge inside)

Note the orientation and slide the new screen back in CAREFULLY. Be careful not to snag the ribbon cables at the other end. (I had to reach in with a small screwdriver to move the ribbon out of the way) The screen will then 'pop' into place hopefully. Make sure it is flat against the front, mine snagged on a tiny retaining clip at the top end behind the front camera. You will easily see this and can lift the clip with tweezers to allow the screen to fully lay flat. This 'clip' is copper coloured and probably grounds the screen as well as holding it into place.

Right, now if the screen is aligned correctly you can press the screen connector back on with some tweezers. Make sure you fully press this in! If you wiggle things too much afterwards, it may pop off again so beware and keep checking! DON'T press with the point of the tweezers as you may damage the ribbon or connector!

Next, put the small black ribbon on that you removed first and again make sure that it is fully pressed in.

You are now ready to press the case carefully back together. I would get it mostly there (some are a bugger to clip back in as I'm sure you will find out) and then replace battery and turn your phone on to check it works!

Hopefully all will be ok now :D

The next tricky part was to clip all of the cover back on! Be careful again or you will break it! You can see the lugs and ease them into place with tweezers and your Credit Card tool. This took me ages (about 10mins) to get them all back in, but don't press too hard or you will break the screen again!

One thing I will suggest is that the most difficult (for me) was clipping the part of the case back by the power and camera button (with the slide closed) I carefully inserted a flat screwdriver so that I could press the flat black plastic into the silver, otherwise when you press the silver from the front the flat black moves too as there is noting for it to really press against, but you want to keep this black still so it will clip into place - if that makes sense!

Once all clipped in, replace the 4 screws - :D JOB DONE :D

The whole process for me took about 45mins.

Hope this helps someone.