It can be done. It won't be easy. Extension offices are a valuable tool, and offer some surprising solutions, even some assistance for free. Start small, and don't ever expect to feel done. No garden is ever done. As your back aches and a weedy vine pops up unexpectedly, realise not even the most perfect seeming garden is ever finished, and will forever be work. Pick the spot you see the most, and make it acceptable to your eye, then maintain that, while moving on, in baby steps. Be patient. Others will see it as a beautiful improvements while you see it as a slow work in progress.