ready to throw shuttle with fresh bobbin
On wider warps I anchor the weft tail with my ring/pinky finger(s) so that the tail of the weft doesn't scoot into the shed, which means reaching in and fishing it out again. The shuttle is held by my middle finger and thumb, with the index finger poised to push the shuttle through the shed.
single 2/8 cotton inserted into new shed with mat body weft overlapping
Generally I try to make my joins in the first inch or two nearest the selvedge. The fresh weft tail is laid in as close to the base of the V of the shed as possible so that the angle of the warp threads will help to trap the new tail at the selvedge.
Currently reading part four of The Sharing Knife by Lois McMaster Bujold. I've been told that her other books have textile references, too, so I'll look for more at the library.