Hello i'll explain the safe trade on Epvp in few steps.
1- You should look the user's TBms and Post ammount.
2- If there is one negative TBm on the users profile it can be a problem.
3- Never do trades without trade request. Otherwise user can scam you.
4- If you don't %100 trust the buyer for your account. Chat from Epvp PM discord or other platform can't use as proof.
5- You an use e*gold for trading.
6- If you want to use PayPal or other payment methods. My advice is take the money first. If the buyer looks trusted accounts you can go first but it depends to your accounts value.
7- You can use middleman. Using middleman is the one of the safest method for trading.

you can find middleman from this page.
In the end my advice is using middleman. You're going to pay middleman fee but it is better than loose your entire account.

you can also read the guide from this link.