Know the "good" spots I want/need to go but gotten to the point I just cant get to them all now. I still make it a point to make one trip somewhere in a unit I have never been. Took that trip over the past 3 days and saw like 13 deer total w one maybe 150" type buck - but hey thats scouting. It was a successful trip.
It is a success if I am sitting on my pad, optics set up, at 12.5k chomping on seeds. Or if that happens it means that nothing broke, the drive is over, then the atv ride is complete, the hike is over, there is no artillery like lightning blowing up, clouds gave way so I can see, and my batteries are charged or at that point the work is over and time to enjoy it for a couple hours until time to start the work again.
I guess I consider success the ability to continue the process as the process or work of it is what I enjoy and even this year as I dont have a tag I will be continuing the process for 3-4 days a week all of August and at the end of that time with or with out a tag the year will be a success.
One last edit is that it is success if you come home safe... The big mountains are a very unforgiving place and mistakes are amplified. I had a atv roll over me last year alone, in a rain/hail torrent, and pin me under the machine. Very close or inches from not coming home and in the end getting back home to loved ones is the biggest success.