No, you don't need any special tools other than the right size and type of screwdriver.

Please Read This Carefully:

You don't sound as if you are very experienced at dismantling laptops so I will give you a couple of tips:

1. They tend to have several different sized screws.
2. It is very easy to damage the motherboard during reassembly if you put the wrong sized screw in the wrong hole.

To avoid this, get a sheet of paper and write down (or draw a picture) of where you got the screws from and tape them to the paper next to it.

Or, use different coloured felt tipped pens and mark the screwheads and the holes.

You problem does sound like a corrupted BIOS so removing the little button battery for a couple of hours should reset it. To not have it connected to the power.

Guys, FYI, this is one of those hybrids that is mostly made of desktop parts and does not have a rechargeable battery.