Well done. Our elderly neighbour has a huge garden which was solid brambles. If not for our own garden landscaping project that needed doing, we would have had a go. But we got her son and daughter in touch with our tree surgeon friend and he cleared the lot. He exposed a greenhouse (untouched inside for about 30 years) and a pear tree. sadly that was last year and it's really overgrown again already.
Look on YouTube for a channel called Flawless Cleaning Services - they do some really good work clearing gardens etc for local people in need of help