Ok let's start with basics. Is this a motorized system? If yes the lnbf is installed as far back in it's mount away from the dish with the connector for the coax pointed straight at the ground when the motor is at 0. If not then yes it is very important the lnbf be skewed correctly for the sat desired. It would also be installed in the mount the same as the motorized.
The mount needs to be tight enough to hold the lnbf from moving around. No more is required. Look again at your lnbf. Most all I have seen have some form of marks on them for adjusting skew. You would be best to purchase one of the little "squeelers" from Sadoun. It is a very inexpensive sat locator. This will help you find signal. The settings you will find at
www.sadoun.com under the
technical support area.
These settings are a starting point. They are usually very close but many have found the 80cm dish off about 5 degrees on the scale. Needing to set 5 degrees higher than calculated setting. That comes from the motorized installs. Do not know if it applies to stationary installs or not.
You also need to be searching for signal on an active transponder for the sat. You can find that info at
www.lyngsat.com
Upon looking up your location I find your dish should be set at 29.8 (you are close enough), AZ at 130 ( 4 degrees is 2 sats away) and the skew is 21.1 but rotated clockwise not counterclockwise.