You can, we actually provide instructions to do this! The difference is three fold; one, the team we bring are experts that have many years of experience in their one area. Two, sometimes an outside company contacting a vendor makes them cringe a little because they know the numbers are being scrutinized very carefully (a good thing). Three, time is money. Although our instructions seem simple, often they require countless hours of negotiating, follow-up, and analysis to ensure what was agreed upon is in place.