No tips of wisdom except practice. I have found that I only need to stand when the Hill gets tough and no gears left. If I still have gears left then I change up a couple of gears just as I stand- Other wise I am spinning out.
I have a couple of mates that turn the final bits of hills into a race. There we are riding 3 abreast and one will go. That is the sign for all of us to stand and go but I am prepared already by being in that higher gear. Not often I am beaten- but that is only for short distances.
But overral climbing strength come from you. Practice again.
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How long was I in the army? Five foot seven.
Spike Milligan