Users should understand what to do in your forms. This will result in more responses and a lot of valuable data for you and your team to study upon.
If you see that users don’t understand with some part of your form, or they are struggling, then make changes and see how that change affects. If good, then great, if not change again.
No matter the importance of marketing tactics, it all comes down to whether users understand what you are trying to do. Be clear, and be precise. You will not regret.