Having a plan is key here. Most strategies for developing pines utilize sacrifice branches while building the trunk and roots. Essentially, the technique involves picking a trunk line that may use one of those lower side branches as the next trunk section, but allowing the stronger main upper leader to grow on to add mass to everything below it for several years before removal. Fwiw, it's very important to establish movement via wire and pruning early on as that becomes much harder as trunks and branches thicken.