".... It won't take long to become experienced.Tree work
pays the best,..........."
This is a great recipe for disaster. you should have public liability
Insurance, and with no Arboriculture qualifications it will cost an arm and
a leg )And one mistake with a chain saw could also cost you an arm or a leg)
Proper training in arboriculture is a 3 year course at college, then there
are a lot of openings.

You don't say your age or where you are, what experience you have in
gardening etc.
If you are serious in wanting to take up Horticulture as a profession you
will find a lot of different training opportunities available.
Why not try doing a search on Google.

--
David Hill
Abacus nurseries
www.abacus-nurseries.co.uk