DonaldRobertson,
Bugger the emails, Dash the phone! Reduce your resume to a business card.
Get up early, dress for work. Stuff your PPE and climbing gear in a a bag, get on a bus if that is how you get around.
Get you and your gear to an affluent neighbourhood at an hour before tree crews may be arriving, stand back and listen for the sound of chainsaws.
When you hear one fire up, proceed in that direction until you find a crew in action. Once you've found tree work going on:
Don your PPE, stand in an obvious position but out of the way. Smile and knod your head, if you see hack/unsafe work, now's the time to boot it.
You may have to wait some time before anyone has a moment, but there will eventually be a break. Ask to speak to the person in charge, hand them your card, tell them you can do this and that job, you're ready to go and want to pitch in RIGHT NOW!
You might not get a job on the spot, but your willingness, determination and preparation will put that business card of yours 10X ahead of a resume, 100X ahead of a phone call or email.
Alternately, if you know where a good local crew marshalls from, follow them to a jobsite, equipped for work and show them you are good to go.
I wouldn't steer you wrong, go out like this for a week, you'll have work by next Monday.
Northwind