John Henry wrote:For the best advice join a club

With respect, I have to say I disagree with this comment, while I agree that joining a club is invaluable, I think that as a response to someones request for advice it is throwaway at best, and does nothing for the OP.
If people can't ask for advice on here, or instead of sharing knowledge the response is "go and join a club", then this site turns into nothing more than a picture gallery, and in most cases unless trees are of the highest quality, threads with people sharing pictures of there work are generally a one sided convo.
Lets get our act together shall we, or this country will forever be full of beginners.
Anyway, with regards to the OP's question,
This is why pines are difficult trees to understand initially, and it does help to have someone who knows them to take you through the finer points in the beginning, in this instance knowing what the tree needs is one thing, more importantly you need to know what you want to do with the tree and where you want it to go. Are you looking to develop thickness and grow it on? in this case, leave it to grow, more needles equals more growth.
Do you want to style it? in this case you need to see what you have, so you would remove older needles up to this years growth to see what branches you have, and then you can style based on that.
Do you want buds back closer to the trunk? in this case you need to slow down the strong areas and balance the energy, then open the tree up to light over winter to allow dormant buds to activate.
The difficult thing with pines is if they are left to run, they will grow up and out, and once you lose needles on an area of a branch it is difficult to bring the growth back, not impossible, but difficult. This means that to allow the tree to thicken but preserve branch options at the same time you need to know how to go about it, when to cut, what to cut etc. Pines aren't hard once you know what your doing, but there's a bit to know.
My process when I buy a pine and do a first styling (bear in mind I usually work on trees with more development than this one in terms of age and size, and better people than me have grown them up to this point) is to thin the tree out and take the needles on branches I wish to keep down to the number of needles on the weakest significant branch (but no less than 8-10 pairs), this will mean that the tree should send out energy evenly when it puts on growth and this is the first step towards refinement. This can be done any time of the year, and will also help to set the tree up for winter to maximize light and air penetration, and allow you to see what you are working with.
From there you would go about your regular maintenance routine as the tree develops. This wouldnt apply for a tree that is being grown on though, so may or may not be relevant.
Hope this helps, at least a little in any case
Kerrin