@Harry Bushwhacker - So far, so good. You have past the initial hurdle. True, it will be 2 years before you can be 100% sure your tree survived collection.
If I were you, I would continue to work on my collecting skills, and to learn, you need to collect more. This tree is probably 25 to 35 or more years old, you have some mature bark. I would continue to scout for more. Look for even older trees (not necessarily larger, just older). Try to find more growing on rock, and preferably without reverse taper. Reverse taper is not important IF you find really old looking, gnarly trunk. Most sought after are those with spiral deadwood scars on the main trunk (shari is the Japanese term for deadwood in the main trunk). A shari like a striped barber pole is one goal in searching for collectible trees.
So scout areas, as soon as the ground thaws is spring is the beginning of the ideal time for tree collection. This runs until buds begin expanding. Then take a break from collecting. Another window of opportunity for collecting begins about 2 to 4 weeks after the summer solstice (middle or late July) and runs through to about the autumnal equinox (about September 21). The late summer period is not universally agreed on to be a good period. I found it okay for conifers, and 50:50 for deciduous.
Key is, you need to practice the unique skills required for collecting trees. First, timing in your local climate. Second the aftercare. So get out there and scout out some more. This first tree was good enough that it suggests to me there are better candidates somewhere near where you found that first one. Have fun.