I have extra O rings for most of my tanks now, and Ive researched that at some point they will probably need to be replaced. Im looking at my tank and these little rings and I have NO IDEA how I am going to be able to do this...especially with the inner ones inside the tank! I have fat little man-hands (even though I'm a petite 5'2 woman!) Has anyone successfully gone through this process? If so, do ya have any tips for me to keep in mind?