94' Gas Tank Replacement.

I have to replace the gas tank in my '94 S-10 Blazer. I have a new tank and sender unit. Do I need any special tools to disconnect the fuel lines or for any other special purpose? Does anyone have any advice or guidance? Also does my Blazer have one or two O2 sensors, its tthe 4.3L Vortec enginer. Thanks a ton!

i just finished my tank swap no special tools are needed for the fuel lines all it should be holden them on is a clamp that you unscrew then you know you got to take the bottom tank braces off and thats about it man