[Mart]

I just watched a couple of videos and jeezus there is some really bad info being spouted.

You need to lift the valve as far as it will go and get something around it to knock the guide down.

There are two schools of thought. First is to try and save as much as possible. The other is to trash everything because it will all be replaced. The videos I saw seem to favour the latter.

Edit: Just saw the pic. The grooves have broken out the end of the guide halves. Your only option is to knock the guide down from above. As it is an inlet try a tyre lever first.

I've got to turn in now as it is late here in the UK. I will check back in the morning. Don't panic or feel like you have to rush anything. Check some of my videos. I have showed it quite a few times.