If initially you don't have someone to guide you, in almost every Centralized exchanges(CEX's) there are always tips and guide on how to carry out these trades, if maybe u have truly read them which u should since u are new to the system, you would have been well informed,.
While carrying out transactions, they will even warn you to make sure you have confirmed your payment before sending any coin. If you are just getting started into anything new, you should first read the get started instructions, tips and guide, that's the best and fastest way to know about any new system, you can also go to the FAQ section to get more info or contact their customer care and ask some questions too, these tools and resources helps a lot most a times.
First p2p is not as complex as many picture it to be , when come to p2p one just have to be smart
This is not true at all, I remember when I first got into crypto and tried the P2P feature, I was really skeptical and unsure, I saw it as something complex and a bit untrustworthy and I am good with tech, I asked my friend to guide me, he just gave me a vague direction saying it's not difficult, well if u know it, it's as easy as ABC, but coming into it for the first time, it might look a kinda complex and shady.