No loan - no income...
Always interview more than one - before you allow credit to be pulled.
Discuss your concerns... Try to eliminate conflicts before they arise.
I am not sure what is stopping you from getting a Realtor - other than the seller not willing to pay a commission?
Hire an EXCLUSIVE Buyer Agent, not just a Buyer's Agent. EBAs only work with homebuyers and there is never a conflict of interest that will jeopardize your negotiating position. I can refer you to an EBA in your area, if you like.
I've written a best selling book called Buying a Home: Don't Let Them Make a Monkey Out of You. It'll teach you how to buy a home and get a mortgage without getting ripped off. Follow the link below.
Best of luck!
Sorry about your unpleasant experience. Given you are first time home buyers I would strongly recommend you working with an agent/broker who can guide you through the process and explain you everything that is happening step by step.
There are a lot of wonderful and extremely professional mortgage brokers that will be happy to help you, And if you haven't signed the contract and gave a deposit yet you can still involve an agent/broker who will represent you in the transaction and/or help you with your search.
Feel free to reach out to me if you have any additional questions.