it is easy and you don’t need a company. I only provided 1 month of bank statement where I applied at. I qualified as a remote worker. No sponsor letter needed. You’re not working for a Thai company.
I redacted my transactions and only had the starting/ending balance + account info shown. You might want to take two copies, one redacted/one original just incase. Every embassy is different
I only had to submit one month at the embassy I applied at; however, I’ve seen different embassies require a different amount. Some require 3-6 months of statements so best to ask the one you’re applying at for exact requirements.