No need peak thru the ceiling la. Mostly can see inside your bathroom already.

For electrical, avoid the drilling vertical along the switch.

Got that one really? Wonder how much is the cost. I found a bit design to drill quartz, it shape just like the normal masonry. Price is RM40. Planning to buy that to make drill easier. Currently, I'm drilling for 1/2 hour for 1 tile hole. Wonder if my tile type is harder one.

What size say? Worth it to get the RM 40 drill bit?

http://www.lazada.com.my/catalog/?q=bosch+multipurpose

multipurpose doesn't cost that much but it cannot be used to drill quartz top, I believe you need diamond coated tip for that one.

Tile doesn't really need 30minutes to drill, just keep dipping the bit into the water to keep it cool while drilling, i'll say I used 5 minutes average per tile hole, I was only using 650w b&d impact drill, my friend used his bosch rotary hammer drill and he drill a tile hole are pretty much under few seconds.

Wow it's actually so hard to drill tile? Or depend on type of tiles? I tot tile very easy to break one

depends on type too, especially those rough surface porcelain tiles, usually in bathroom those type, good luck with those if you're using rm150 drill like me

I'm currently using this kind of bosch bit. RM8 per bit. The front metal masonry easy to chipped out, but still can make the job done.

My half drill cannot compare to the experience sifu. I'm still lack of skill and experience doing this.