I have done it on a white pine of similar size. They are quite flexible but you need to be careful. First prune (only what is in the way and leave everything else) Then wrap the trunk starting well before the bend and finishing well after it. I like to use strips of material from tee shirt or similar. Slightly stretchy but not pure cotton because it rots too fast. Pull it nice and tight and go over it at least three layers over the bend area. Now you need to find an area on the lower part where you can attach the wire which will hold it so it won't slip. Cut 2 pieces of rubber (an old hose cut down the middle is good) and fit one on the bottom friction point and one on the top point. If they move use electrical tape to hold them. These points need to be in the right place because if they are too far up or too far down they wont do the job. If you can get someone to help with tightening the wire you should. Otherwise, slowly bring the branch down while concentrating on the main point of stress. Use your fingers to feel and your ears to listen for cracking. Go down enough so you can hold it in place with a tie of some sort. If you are confident it will go further, use some strong wire like stainless steel or copper and make a loop over the 2 friction points protected with the rubber. Now if you can grab it and squeeze down with one hand, you can use the other hand to wind the wire as you go. Pull down - tighten - pull down - tighten. If you are lucky it will go all the way until it touches itself and you can lock it in that position. If you are worried about cracking or breaking, you will need to leave it until the end of the season (late autumn) and go the rest of the way. Don't prune or wire anything at this point just leave it as is and keep the tree nice and healthy. After one or 2 years you will be able to release it and move to the next part.
PS Let it dry out before you attack it, water when finished - preferably with a seaweed solution.
. Whatever is done straight section(s)of trunk needs to change.
