Ack
There are two schools of thought on tree planting.
One, plant it water it in and leave it alone. This is the method that is used by several tree farmers I work with.
Two, plant it stake it for one year water it in good and only water when the tree needs water. Texas A&M tree planting guidelines only call for staking a tree if needed but for no more than one year.
As for watering you can stop now you are more likley to kill the tree by over watering than under watering.
Texas A&M Guidlines
http://aggie-horticulture.tamu.edu/publications/landscape/tree/planting.html
