I've gone through this exact experience 2 times. It can be hard to figure out if someone is going to do everything they say they will if you haven't already worked with them.

One of the most important skills an entrepreneur can learn is how to pick amazing people to join them. Otherwise a company will be mediocre like most out there.

It's really hard to build a company on your own. I've done it a few times now and I would advise you to be open to others helping you. It makes the road much easier and more fun. There are plenty of trustworthy, hardworking people out there. You just need to understand how to find them and set expectations.

If someone is interested in working with you, start with a trial period to test them out before getting far into an equity split (assuming you don't have the capital to pay a salary).

Can you presale any customers to get funds?

If it's a employee, they need to vest over time. 4 years is typical. This protects you if they don't work out.

Let me know if you'd like to talk through this more.