1. Take it home. Never sign at the counter. Say "I'd like to review this at home." If they won't let you — walk out.
2. Search "[company name] cancel" before you sign up. The complaints tell you everything. If hundreds of people can't cancel, you won't be able to either.
3. Find the exit clause. Before you look at the price, look at how you get out. What's the cancellation process? Is there a fee? How much notice do you need to give? Can you cancel online or do you have to call/mail a letter?
4. Screenshot everything. The deal they offered you, the terms on the website, the chat where they confirmed the price. Companies change their terms and deny verbal promises. Written proof protects you.
5. Pay with a credit card. Credit cards give you dispute rights. Debit cards and bank drafts give the company direct access to your bank account. Never give a company your bank routing and account number unless absolutely necessary.
6. Set a calendar reminder. If the contract has an auto-renewal date, free trial expiration, or rate increase date, put it in your phone right now. Future you will thank present you.