Have a look in the STILO Guides for removing a front suspension strut
BUT before you do, I would seriously advise you to have the actual spring replacement done at a proper workshop with a safety cage. It'll be done in seconds with a proper compressor for very little cost and isn't worth the risk and the hard work of doing it by hand. The Stilo spring is an odd shape and doesn't compress evenly so it is likely to go all over the place when you compress it
If you get a quote to replace the spring you'll probably find it's well worth just letting a garage do it. It won't even take them an hour
Make sure they know about lining up the top bearing as a few have made mistakes and had to do the job again