If you follow the instructions and use the set up tape it is so simple it is almost funny.
Easiest thing to do is get it dialed in dead on at 20. Then put the number zero of the sight tape directly inline with the needle. Keep moving back to 60 until you are right where u want to be.
Once you have your 60 yard all dialed in, the number that your needle is pointing to will be the number of sight tape that you will need.
Once you have your sight tape all picked out, move the needle back to the number zero, stick the 20 yard mark of the tape right over the set up tape, stick a clear cover over it and go shoot.
I've done so many of these for different people. If they can shoot well it takes about 15 mins.
On a side note you want to make sure that when u mount the housing you have it as low as possible on the bracket so that you can get the most travel out of the sight. A lot of that depends on anchor point and peep height.
Goodluck and if you have any questions send me a message