Your braid looks good! I’m glad you persisted.
It can be challenging to work with imposter without it snagging or tangling. A lot of it is, unfortunately, just practice handling the materials. Sometimes tangling can come with static electricity and wiping down the fibers with a paper towel can help. If you have any resistance when you go to loosen a tama undo the slip knot, wind out some fiber, and redo the slip knot.