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@D._Generate
Back in the States I brewed quite a lot, though never made wine. It's not difficult to do at all, but you'll want to keep things sterile or it will taste nasty. The airlock prevents wild bacteria and yeasts in the air from fermenting your beer/wine. You want to use the good yeast you have to give it the flavour you're going for. Wild yeasts will make it taste rather horrible actually.
And don't bottle anything until you're dead certain it's done fermenting. Ideally measure it with a hydrometer before and after. If it's bottled too soon you'll make have little grenades of splodey brew.