Remember, this is your wedding, and you hold the checkbook. While they have the professional experience to meet your needs, you know your financial limits. Don't sign a contract without a clue as to how you will pay for your service or product. Who wants to start a marriage in debt? When you cave easily, you leave yourself open for future pressure tactics and manipulation. This may be the only wedding you will ever plan, so be smart! Don't get scammed!
These examples are not to say that all vendors are bad, or vendors who do use these tactics are shady. The key is to get you in tune with the cues that could leave you open for misinterpretation. Surround yourself with great vendors and do your research. Ask someone to look over your contracts. Your wedding planner will be able to decipher which clauses will protect you and which could be to your detriment. Always take someone with you on vendor visits: your wedding planner, your mother, your maid of honor, etc. They may catch a detail that you may have missed, which might be crucial to your decision-making process. All in all, enjoy yourself! Planning your wedding should be fun and stress-free!