Hi Phillip,
You mentioned you where going to start a Landscaping/Tree business..
My advice to you would be to concentrate on building a solid client base on the Garden/Landscaping side first before heavy investment into arb kit. Get all the tickets while it's funded!
A garden maintenance/Landscaping business takes little to get off the ground. Just a lot of tidy/neat work (graft) will soon have your name being passed about and your business will grow.
Like Kentjames I started small then moved into arb work once I had a huge client base. For the first two years I sub contracted the climbing work out so that I still made the money out of the job for finding it basically. Or at least made as much as the climber as I was providing him with lots of work.
If you can't afford big kit and you don't have the work for it day in day out don't buy it. Hire/beg/borrow.. To get you through the piece of work.
If your totally 'green' to tree work (no pun intended) yes I'd agree, go get some experience else where. But if you have some arb experience and /or a contact, maybe a friend, even other local businesses...(ask to hire a climber for the day, I pay my climber minimum of £200per day as I trust him to look after me and my job)
You get the work through your business: cost them in and watch and learn, that way you pick up experience but make the money you need to grow the business and buy the big kit.
Cost wise, I now usually do all the ground work or provide man power, and get a climber in to do the jobs that are above me. (I will get there in time)
If you want to do this as a living and set up your own business I'd start as soon as possible. It takes little experience to cut grass and weed neatly.
Tree stuff is a lot different. (Bluntly more dangerous for you and the properties you'll be working in) Don't be afraid to pay experienced people to do what you can't . Anything straight forward do it yourself.
Tree/arb work is tricky to get into unless you have the client base from gardening . Most areas will have trusted and professional Tree Surgeons that have the market already. It's not something that's easy to jump into.
I agree mostly with the others, this is merely a more business orientated sway on your situation.
At 31 when I started I couldn't have afforded to work as a groundie so i just had to get on with it.
Grass it like hair....rarely stops growing..
Good luck and stick in