Know that fears are normal.
When I'm asked to do something, I research it to hell and back. Even if you only get halfway, you can be confident you'll know more than most. So head up, speak with authority and if you don't know the answer to a question, don't lie, own it and say "I don't know. I'll get back to you on this."
You're in the engineering field? Good. You probable know MS Excel. Start a spreadsheet with the goal of having a 5 year projection.
Call a seed company and ask for a quote for X acres. Talk to a farmer about costs. They're super knowledgeable about planting, fertilizing and harvesting costs, SALES AND CONTRACTS. Contact other hemp farmers, I'm sure there's an association or something. lots of work up front and dont make a bank appointment for next week. You need at least two months lead time to get to know the numbers intimately for the bank.
They'll want a business plan. DO IT. I don't care if you don't know how to write one. Just start it and it'll come together. Trust me. Google is your friend.
There's more but you'll discover it as you move along.
As for getting let go, he probably will. But you'll have to work that into your price. Get a contract. ALWAYS. Even if he does let you go, you'll have valuable info for other farmers as a Hemp consultant in an emerging market. Sound like a sweet position to be in. Try to work a small retainer into your contract.
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"There could be shadow galaxies, shadow stars and even shadow people."
-- Steven Hawking
"Gods serve us because we know so little about the world."