A couple of tips for making weaving shibori easier. When you need to add a new plain weave thread, you will not want to add it where it is beside a resist thread. You will be pulling out those resist threads and it won't slide out as easily if it encounters threads you have overlapped. Since I am weaving four plain weave rows between each resist thread row, I will try to add the spliced thread on the second or third row.
I also find it helps when I am ready to pull the resist threads that I have loops to grab. So if I have had to add onto the resist thread, I will tie a knot on the edge. It's not that critical, just makes it easier.