If you want to become a better close, you should trial close your prospects in almost every interaction that you have with them.
Trial closing is basically performing a test close. You do this by checking in with the prospect and asking questions to see where their head is at and if you are heading in the right direction. Here are some examples of trial closing questions:
What do you think about what we have shown you?
Does this match up with what you were wanting to see?
Are we heading in the right direction?
Could you see how you might use this solution?
Do you think this will help your organization?
Is there anything that you could see that would prevent you from moving forward with a purchase?
Here is a brief video from a webinar that we did that provides a little more explanation on trial closing.