Disco 3 (LR3) D3 Air Suspension front air valve blocK

Hi All

On my D3 the front is very slow rising then when left is dropping to the block. The rear is raising fine and holding height. Have looked at a few threads this seem to indicate the front valve block. I’d like to have a go at changing this myself and hopefully avoiding a costly trip to the garage. I am a novice and only have basic tools. How easy is this to do ? what tools will I need ?

Is there any good tips for doing this

Thanks

Matt