To make sure no parts that will affect the steering alignment are bent or broken such as tie rod ends ball joints wheel bearings spindles struts control arms ect ect.
Changing power steering fluid lines in your vehicle should not affect alignment.
A wheel alignment is what syncs your steering wheel with your wheels. It ensures your car will drive straight when your steering wheel isn't turned.
Get an alignment.
There should be an alignment mark on the steering shaft and the steering wheel.
Get an alignment
steering alignment needs to be checked
When you have the front end aligned the mechanic should align the steering wheel also. This is so the steering wheel is positioned straight when you're driving straight down the road.
The alignment is miss-set or the front suspension and steering is damaged, OR the steering coloum is broken or damaged
Without actually going to school you can read a book. Here is one.http://www.amazon.com/Automotive-Steering-Suspension-Alignment-Edition/dp/0132747766
The most effective and accurate way is to take it to a local reputable auto repair facility that has an alignment rack. Have them do a complete alignment. Your steering wheel should be straight after.
Steering wheel shakes
could be bad alignment