I've been watching YouTube videos of structures I like, and duplicating them in order to learn. I am seeing some results: I designed my own pub the other day and I think it looks quite good, if I do say so. A couple of good YouTube builders are Pixlriffs and Grian.
Playing in PE on a tablet, fighting skeletons in melee is almost impossible. I have learned how to handle it, some, but when I first started playing the knockback was just insane. I couldn't get close enough to ever hit them.
Playing on a server, catching fire in the Nether seems to cause so much lag, I sometimes stumble around. Screen informs me I'm dead before I even know I've stepped in lava. (This is not 100% of the time, but it can happen when the server plus my computer are both laggy.)
I've conquered one. I was fortunate to have some good armor enchantments suited for the job, so in retrospect it didn't seem that bad.
Ideally you will want boots with Depth Strider, and a helmet with Aqua Affinity and Respiration. With a high Respiration enchantment, honestly, water breathing potions were almost not worth it. Also, if you take milk to get rid of the mining fatigue (and you should - I would say 5 buckets minimum), you will cancel all the other potion effects as well. You can place a torch on a wall, it will create an air bubble for a fraction of a second. Placing a ladder on a wall makes a permanent air pocket for you. Combine that with Respiration, and I really didn't use water breathing much.
I would go in from the top and try to find the Elder up there first. I used a strength potion to make it easier to take him down, but they're really not all that bad once you find them. Then the other two are supposed to be in the wings of the lower structure. These can be harder to find.
After I got those 3 Elders out, I was lucky enough to find 2 sponge rooms. They were instrumental in drying out the interior of the structure. I walled off sections to work a small amount at a time.
I know this doesn't apply to the situation, but learned the hard way to not take your "preciouses" into the Nether if you're going there for construction. I was building a walled off tunnel across a lava lake, but got knocked off by a ghast at the wrong time.
I took this screenshot to show some friends how fences will apparently stop Endermen. It was only afterward, when looking at the picture, that I noticed what appears to be a smiley or clown face underneath the black exterior. Does anyone know about this? This seems too specific to be a mere artifact of the texture.