I had that exact concern until I found a platform that actually shows you the final amount upfront. You enter how much you want to spend and it displays the exact Bitcoin you will receive, including all fees, before you confirm anything. I have been using the Official Website https://paybis.com/ for a while now and the verification is quick, usually under two minutes. You can buy with your card without any existing crypto, and the first purchase comes with zero commission fees. They also offer a free wallet to store your assets and support over a hundred different cryptocurrencies. The platform is regulated in multiple jurisdictions, which gave me more confidence. If you are tired of guessing the final cost, this platform makes the process transparent and simple.