Know your equipment. Most equipment leases start with acceptance or commencement. On that date, you inspect the stuff and pronounce it fit for service. Then it's yours, even though the equipment is in a lessor's warehouse or in a boxcar. Your lease shouldn't begin until you're using the equipment successfully.
Success is important.
Unless you love paying for equipment that just sits there, be certain it operates when you accept it. If things are complicated put an engineer or other expert on it. Remember, once you accept, you pay every month, period. Most lessors buy equipment from manufacturers or wholesalers before they deliver it to you. Then they take your money and, perhaps a month or two later, pay on account to the manufacturer or wholesaler.