Hi Daycab,
I'm facing this question as well. I have a different approach to hourly though. I think it would work better than saying to someone "I'll do it for $X an hour."
Some tilling jobs you will spend more time getting the tractor ready, traveling, setting up, driving home, than actually tilling the ground. So if you tell someone $40 an hour, then spend 15 minutes tilling, they'll want to pay you $10 and you'll have to really make it up in volume to break even (grin).
I think a better approach is to figure out your costs per hour--and some it will be based on guesswork, such as how many hours per year you plan to work for pay. But if you know your costs are $25 an hour, you need to make at least that to cover your costs.
Once you know this, then you can estimate a job IN YOUR MIND at a rate you choose. Say 30 minutes of tilling, plus 30 minutes set up/travel, so bid the job at $40 flat for a one time pass or $75 for once now, once in a week. If customer wants to know an hourly rate, you can say you base your estimate on a fair rate for the equipment, your skill, and your time.
That does a couple of things. You don't have to feel like you have to rush. The customer will know the price before you start. And you can do a quality job, have an iced tea with him, admire the work, etc. /forums/images/graemlins/smile.gif
I'd like to tell you that this works great, but I'm just starting, and haven't had any customers yet......
Best wishes,
ron