Once you have placed your pins ( four of them ) for your half way points, and deturmined where seams are likely to go, it's time to cut and anchor block cuts. Assume this is a chair. Assume we are NOT railroading. Assume you have plain weave cotton, the proper weight.
This is my procedure. I learned from tall men with strength. I am not petite, so this works for me as well. Hope you can do it.
Taking off the longest cuts first: hold the bolt cut end , four yards pulled off ( but not cut ) up to the outside back. It does not matter if it's a print or solid, or if it's rolled on the bolt upside down. Hold it up there, from top back to skirt length, add six inches or so, and clip the selvage. That's a mark to refer back to.
Next fold the yardage in half to see how wide half is ( and to see if half covers the back with some to spare. ) If half works, check to see if the motif falls where you want it. If you need the whole cut to use motif properly, fine. If you need more inches on the cut to move motif to a better location, fine. Time to whack a cut.
At the clip in selvage ( or further down if you need more for motif ) fold goods over onto itself on bolt, selvages meeting at the top. Smooth and flat, with a fold, this usually means right side in, but that's not consequential. Once smooth grasp the fold top with left hand, insert good sharp sheers into the fold with right. I am a righty, leftys figure what you need to. My bolt is on my left, on the floor, several feet away from the hank I am whacking off.
Slide the shears, 1/2 open, fabric touching about the back of center of the blade, while pulling upward with left hand. Using my right leg I am supporting the fold so I can see it all, and so that it remains straight. At 5'3" I can do it without repositioning. I am tall enough. It's all one motion. If not, assume scissors need to be upgraded, not that you are too short ( unless you are in fact much shorter ). I can do this with 54" goods at 5'3" tall. Some of it is on the floor at first, granted.
Okay: if the cut you have removed can be split lengthwise and fit ( halves ) the inside back and outside back, great. If the cut is only wide enough on half to barely cover the back, noting what I have said about the purpose of excess size of cuts, decide if you want to use the whole thing.
Spilt and dedicate to inside back as well, or cut another cut for inside back using same procedure.
Note: I use a concept I call picture framing. That simply means to me that I choose where on the body part my best center occurs. Happens that ( not coincidentally ) my motifs ride high on my inside back and outside back. That means the halves of my one cut when split to be used on both inside and outside back are most often situated the same, automatically. Note if a half drop, use the lower framed motif on the back if need be.
Practice this much ( or do it mentally ). Tell me what's uncomfortable about it.