In the south, pines are weeds. There are some varieties that are nice, and all are useful for lumber or pulp, but for a homeowner with land, they're just a pain. When I bought my house a few years ago, it was pretty clear of volunteer pines. The house had been vacant for a while, and the upkeep was limited in some respects, but the approach to the house and the back yard were in relatively good shape. A few years later a number of pines had grown up, and I cut a lot down with my clearing saw.
Fast foward two years, and the ones I didn't get last time have grown up (in some cases they were too small to cut with the saw (the stems just bent away from the saw blade)]. Then others have grown up as well, and some of the ones I cut two years ago coppiced (small shoots grew out from the trunk below where I cut, in turn growing taller themselves).

So I went to work. One area was dense enough that I was able to make pretty short work of them with a pair of loppers. The stems were so soft that I could cut even fairly large ones easily.
Based on size, these were probably up to about four years old. Most were probably a couple of years old, which sounds about right given the last time I cleared the area.
A few were as large as 2" in diameter near the base, but most were 1.5" or less. Probably a third of them were slender stems with plants that were 18" to 2' in height, just 1-2 years old. And there were some sprouts, which I just pulled.
After about an hour of work, the area above looked like this:
Most of them are on the ground and stacked in the foreground of the photo. You can still see additional standing pines to the left and more up near the house. After another hours' work, the lower ones are all gone and about half of the ones up near the house have been felled, as well. They're all loaded on the truck now for a trip to a mulching place.
Before hauling them, I'll strap them down to hold them in place. This is probably 300-400 trees.
After this, I have plenty of other pines. There are some in an overgrown pasture that are now over 10 years old, so they're pretty large. And I have others that are 5-10 years of age, plenty tall in their own right. The older ones have some value as firewood, but the stems in the truck above are too small to make that worthwhile. Stripping the side branches and cutting the stems to length wouldn't be worth the effort.