94 YJ wont start

ive got a 94 yj renegade that wont start. It has a new starter, battery and exhaust system. It will crank but wont turn over and fire. Ive been researching a bit and the crankshaft position sensor seems like a popular culprit... if it is, how easy/hard is it to install and if anyone has any pointers on the install any help would be appreciated. Thanks

The CPS should be on the top of the bell housing. Or towards the d/s of the bell. It's not too tough to remove, there isn't a lot of space between the bell and the firewall. Have fun