@Furu I like your response and can see your reasons for wanting to do it yourself, but I still think the risks involved would lead me to paying somebody else.
All jobs have their own expertise requirement to do them easily, more importantly safely, and involving another person, no matter how competent at other matters, increases the risk exponentially because he does not have direct access to your brain whilst undergoing the task involved.
If it was a one man job then I would be inclined to say go with your own ideas, but when it needs somebody else, I have always been reluctant to tackle such jobs ever since my father became too old to be the other man.
We have all seen pictures or heard of "widow maker" trees, but there are many more widow makers out there than most folks will ever come across.
Easy for me to say, despite frequently not having the cash spare to pay other folks to do jobs, but I think this is definitely one I would not tackle myself despite 60 odd years of farming around the world on my own.