Totally get that. You don't need a full exchange for a straightforward purchase. Look for a service that's just a "fiat on-ramp." You pick how much ETH you want, they give you a total price with fees included, you pay, and they send the ETH to your address. It's much more direct. For example, you can check out
https://paybis.com/buy-ethereum/. The process is linear and clear, which is ideal for a first-time buy without the trading platform overwhelm.