Fucking PISH mate - would do em all day long if I could

Easiest way out is sit inside, foot up on the glass, top corner of screen and push with a little pressure. Using a large flat blade screw driver, gently un tuck the rubber from inside the car. Do this all the way along the top till the top and the two top corners are out.

Then outside the car just pull the whole screen and rubber forwards till you can lift it out in one go.

Remove rubber from old screen, fit to new screen (pish easy to do, you'll see how when you take it off)

Get some rope (thin-ish, don't want it too thick, or that coarse "frayed" type stuff either) and in the outer channel of the rubber (that the bodywork sits in, push your rope into it, all the way round, nice n tight. Make sure you leave a foot or so at the bottom middle for you to pull. Best way is to start from bottom middle, work clockwise, and over lap the bottom bit by 6 inches or so...

Then lift screen into place - it helps if you can get the bottom metal part of body into the groove in the rubber as far along as you can. Make sure it is lined square.

Sit inside, and begin to pull the string UPWARDS (always pull the string AWAY from the edge you are doing: so if you are doing the bottom, pull up, doing the left side, pull to the right, etc, with the string as FLAT to the glass as poss) It helps if you have a mate on the outside applying a bit of pressure, but if you are on your own, pull the string 6-8inches along, then go outside and tap the screen down by the rubber WITH A CUPPED HAND (never smack the screen with a flat hand, you could crack it. Don't be afraid to hit the screen, only ever seen a few crack, and that was from FLAT hand slapping

Go all the way round with the string, stopping ever 6-8 inches to tap it down from the outside. My advice, if you have never done it before : do the half bottom and one side first, then do the other half of the bottom and the other side, THEN do the top (go halfway) then do the other half of the top. The most important thing to make sure of is that your corners are sitting in properly and it is lined up right, other wise it won't sit tight and it'll leak water like a sieve

One last tip for you. If you have a squeazy spray bottle like this;



Empty it and fill it up with some screen wash fluid (the blue liquid is good). Spray the metal area of the screen aperture liberally with the screen wash BEFORE putting the screen in place.

Why? It is a natural lubricant. Screen wash is slippery and lubricates better than water. Most screen wash also contains alcohol and evaporates, meaning it won't sit there and rust your car You can also spray it all round where you put the string/rope on the rubber to. It just helps to let the rubber pop in nicely, so you con't have dry rubber being pulled against dry metal, which creates friction and is more hard work.

Lastly, here's a little diagram of what I mean;



(When you have fitted the new screen to the rubber, your string/rope goes in the gap where the car body aperture goes )