I probably would have wired last year already.
It gets increasingly dificult to wire the lower trunk with age. And exactly there is where adding a bend can help create a bit of interest to the trunk.
This is the time where you also can start looking at future development. For pines it is important to realize that you cannot easily cut back; You can only cut as low as the lowest branch. So you need to retain the lower branches.
The process is really something where one could write a full book to get a start.
This is a two year old seedling black pine. My 6 year old pot grown is still flexible enough to wire and bend. I don't get the hurry. At least wait until the needles on the trunk fall off naturally. That will proboably happen come authum.
I am not arguing, I am discussing. Perfectly fine to do in a discussion forum.
This is my 6 or 7 years old black pines still flexible enough for bending the lower trunk:
That is the pot grown ones. On the ground grown ones it is too late.
But that is great! Now the OP have two different opinions on the topic. That is how everything work in this hobby. People do have different opinions. In the end it is important to have a vision for ones own trees, make a plan to reach the vision and understsand how much time it takes.
I agree with Leatherback, I have one about this stage, it already has some movement on the base, and it's now more difficult to do so if I were to do it...
It's not about hurrying the process, and at this stage it's not all about the final design either, it's about adding something now that can give you some potential later, specially if you're aiming for a smaller tree.
That video might help you, I find very productive.
It always baffles me that people do not wiring seedlings. The whole POINT of growing by seed is that you can affect the shape and development from day one. If you not do anything till they are 5-10 years old, you are much better of going to a nursery and buying that plant.