Going back for a FET. Questions about the process.

Hello! I had a successful FET with my son who was born October 21st, 2018. I am looking into the process of going back to transfer one final embryo. I wondered if anyone could share with my your process? Did you have to go through all the exams and clearing of your tube in order to transfer your embryo? I am a little anxious Bc I have two kids but wanted to try for one more. My husband wants us to try for a bit naturally but I am not having a lot of good hope for it happening naturally. Thanks in advanced for your input!