The Microsoft Product Team has done a good job of giving us various ways to find the right record when populating a lookup field in Dynamics CRM. They include:
Select the Lookup Icon
This is the ‘standard’ way that many use the lookup feature. It requires several clicks so I generally avoid it or use it if all other options fail to return the record needed.
Recently Used Values
Begin typing a value in a lookup field and CRM will display recently used values to include the ability to delete values from the list.
Type & Tab
Begin typing a value and tab out of the field. CRM will display the record if only one match was found or display the indicator that multiple matches were found. You can select the correct value by selecting the indicator.
Type & Display
Begin typing a value and select the Enter key from your keyboard. CRM will launch the search option from within the lookup field and display a list of possible values.
Try them out to discover which is your favorite.