A good line launcher (APTA) and rope walking set up is essential, but NEVER trust redwood limbs with your life if there is a shred of uncertainty. Ever! You will die!!!!
If this is any doubt you must employ the flip-line around the trunk as you rope walk technique or simply spur up.. Despite what a bunch of arborists with basically zero knowledge of climbing Redwoods will tell you, a redwood could give a rats ass if you put some spurs in it....Fucking things don't even know your are there. If you want to be really concencious you can wipe your gaffs down with bleach or alcohol before each climb to make sure your are not spreading disease. This is a good practice no matter what or where you are climbing...With some practice it can and will become a nice fluid motion...
Richard's video gives you an idea of the basic technique, but please DO Not take a wrap with your flipline or you will be going nowhere, real quick. You must also be good with a flip-line or it will be tough to be very efficient in anything 3ft and over.....Once you get the technique down you are simply rolling your flip-line up the tree as you simultaneously rope walk.
You are welcome to PM me if you have more question about climbing Reds, and welcome to TB and happy holidays..