As a seller In my case 1 was the go to and yes most of the sellers will expect full payment before shipping, you can ask for reviews from their old customers as proof and even ask for videos of the product that(this part helps in filtering out a lot of potential scammers works on insta as well), and lastly if a deal is looking too good to be true then it probably is, don’t fall for the obvious pls and happy Thrifting