This can easily throw your fence line out of alignment.
String line fence post.
Corner posts should be buried deeper to the ground at least 2 3 of the entire length of the post compared to your line posts at least 2 feet.
Drop a post into each hole and line its face up with the string while you plumb it.
Stretch mason string between the centers of all the batter boards to delineate the perimeter of the fence.
In other words the string will run where the fabric or wood pickets will be located.
The lower string is to the ground without touching the ground the better.
Measure the positions of the posts with a tape measure and drive a stake at each point.
Well this is where you have to sort of take a guess or at least i did.
How do you know you are parallel with the property line is the fence actually on the property line.
Mark the positions of the line posts and dig a hole for each one directly under the string.
Hammer your stakes in clear of your post holes so that the stakes are not disturbed during digging.
Pulling a string it s really called mason s line tight between two points is the best way to build a fence straight and true.
Considering this your corner posts should be longer and if possible larger than your line posts.
I like to use fast setting concrete for these posts.
Use a string line level or bench level to make sure the line is level then check to see that.
The outside edge of the stake should just touch the line.
To ensure the posts are even in height run a tight string line between corner posts and end posts.
Using your string line you will run the string on the outside of the soon to be installed fence.
At this point you pull the string to where you are placing the opposite end post.