Here are a few tips to keep in mind as you move towards the final stage of securing your customer.
Allocate the right amount of time to the meeting.
There is nothing worse than telling a customer you need about 5 minutes of his time only to find that he takes you at your word gives you 5 minutes between meetings. No matter how large or small the business is, make sure you set aside enough time to cover all aspects of the proposal, and time at the end to answer any additional questions. Don't try to cram in the meeting between client visits and leaving for the beach for the weekend.
Know when you can start
Be prepared with a start date. If the customer accepts the proposal, he'll have an idea when he wants you to start. Don't delay giving him a date by not having your updated calendar to hand.
Make sure you have all your documentation
You'll need copies of the proposal for the customer and maybe the accountant of the firm, so it's a good idea to get a few extra copies so you can distribute them without someone having to turn on the copier, delaying your start and eating in to your meeting time.
Don't just turn up on time, turn up early
I know you thought that once you set up your business, you wouldn't need to worry about job interviews, but think again. The preparation for closing the deal is similar. You need to give yourself plenty of time to get to the site, allow for traffic, be well-groomed, etc. But the few minutes downtime you give yourself doesn't have to be spent in the lobby. If security allows, take some time to walk around the business and see how the users function. See if there is anything else that strikes you as you consider your proposal.
And now it's time to present. Give it your best shot.