I second the @Dave Foster recommendation. I used him last year for mine. While I am just a stranger on the internet. You are going to most likely have a stranger hang on to several hundred thousand of your dollars. So everything you can do to avoid a scam or a shady character is worth something.
The rules are as you stated. 45 days to identify up to 3 properties you might buy, 180 days to close. You must spend more than your net selling price. (Loan balance, purchase price, etc etc don’t matter.). You must reinvest all “cash” you receive ($’s above current loan balance.).
What I did was after my sale was under contract and I was down to a couple weeks from closing I started shopping seriously and had my replacement under contract a couple days before my sale closed. That was I was able to close my replacement before the 45 days had even passed. (So if the deal fell through I would have time to list 3 other properties I might buy.)
Good luck. 1031’s are an insane tax advantage and Dave is very good at what he does.