Could you maybe post some pictures and more details? How big is it, sunny/shady, soil type if you know it, what is it overgrown with, and importantly what kind of garden you want to end up with? I'm sure people will be able to offer advice if we know what you're starting with and where you want to end up.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
Hi James, the best thing to do is get everything identified (especially any suspected weeds) so they can be removed before spreading further. You'll need to identify overgrown shrubs and trees to know when and how to cut back, otherwise you may damage or even kill them.
It does all seem overwhelming at first but I advise you to tackle a relatively small area near to the house (eg a main window view) first, and do it well. That way you'll see an almost immediate result and can then go on to the next area. If you haven't been there long, you may have some real treasures so best wait a full season before doing anything drastic like landscaping or unknown shrub and tree removals.
A trowel in the hand is worth a thousand lost under a bush.
I'm with Bob on this one. Nibble away at the problem, gradually moving out from the house, and providing you keep at it and don't give up in despair, you will eventaully tame the lot.
I agree, if you can see that you're making progress it will encourage you to keep going. As Jenny says, if you can post some photos and tell us what you want, e.g. patio, lawn, flowerbeds, then we can help one step at a time
Taking photos will also help later. You can look back and see how far it has come-and you will have dates marked down on when things were accomplished.
Putting them up here, and telling people about your plans can also help you to identify any problems you might not have noticed existed, get you help to fix/remove said problems, and identify exactly what you want out of your garden.
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As Jenny says, if you can post some photos and tell us what you want, e.g. patio, lawn, flowerbeds, then we can help one step at a time