A few little modification and changes in thinking and planning of a tour can yield tremendous benefits. These benefits can be financial or non-financial the best way is to research on our own if time permits but if not it is better to handover the tour project to a professional travel company of repute.
 
Following are few mistakes commonly incurred and pointers which might help in planning a tour.

• Planning for the trip is done with no sufficient time in hand
• Inadequate information about the destinationNot sure about interest and preferences related to destination
• Not asking for the proposal in writing
• Not asking for proper documentation like Confirmation voucherNot spelling out expectation about the standard and upkeep of the vehicle to be used
• Not  spelling out expectation with respect to skills knowledge,  & hygiene of the accompanying driver
• Not clearly stating meal preferences and allergic factors
• Not stating medical condition
• Not insisting on cancellation policy from travel agency
• Not seeking clarity on schedule of payment
• Not checking market prices of the services involved
• Not asking for communication modalities before and after the tour
• Not creating documentary and visual proofs of the issues during the tour, if any.
• Not checking the credibility and reputation of the travel agency.

 
Conclusion : If you cannot allot time to plan and execute your trip yourselves then the list that you must do is to research a professional and empathetic travel company to do your work.