Understand what you are looking for in your vendors. Make sure they are on the same page as you and your family.. In order to make the best Simcha, be as upfront with your vendors in order to avoid issues later.
Make sure you read the contracts thoroughly before signing. Understand everything you are reading and it's okay to ask questions!
Connect with other people who have used the same vendors. Ask on their experience. See how they were overall. Knowledge is key to enjoying your simcha!
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