There's no need. Go ahead and sign up for a Free account. You may use it for as long as like (even forever), then upgrade to a paid account when you're ready. We're not rushing you.
You do not need a credit card to sign up for a free account, you may provide that when you are ready to purchase.
If you do decide to upgrade, you have an additional 30 days after payment to request a 100% refund if your not completely satisfied.