Steering wheel Can i change the steering wheel myself or doe's it need to be carried out by a garage and how hard would it be?

Wishbone bushes or steering rack adjustment

i would say it is a solenoid or air in the power steering lines but you would have to put a obd2 scanner and see what it says.
if i remember correct bleeding is as simple as removing the power steering cap and turning steering all the way left hold for 5 seconds then right and hold but you will need to look at oil in reservoir and see if it is bubbling while turning and holding. you will need a helper and if it is do this for 5-10 minutes.

U can do it u self but very arcward not the best job.
your problem is there a small stalk that sticks out behind the lever wen u straiten out it catches this and turns of this small piece does break of quite frequently.
To do this ur self u will need 2 remove the plastic colwing around steering wheel their are small screws holding this together, then check if the unit screws together or is one piece if the latter 1 piece the steering wheel will need 2 b removed first check if air bag type steering wheel if so sorry take to garage hope this helps u

I'm going to agree with the rack conclusion. Keep in mind I can't see it for myself.
If you take the load off the front wheels, you should be able to turn the steering wheel without effort.
If the effort changes while turning the wheel, the only things affected would be the rack and the column.
If you notice it turns ok with the engine off but not with the engine running, it could be something with the pump or one of the lines, or still something with the rack.

leave well alone and stop playing weekend mechanics ,it never needs changing

sounds like sum1 had the steering wheel off. u need 2 put the spring and c clip back on rite on the steering shaft. its hard 2 do. may need 2 ppl and 2 screwdrivers 2 doit. i can 2 it by myself but its hard

This sounds like you need new track rod ends, this would cause free play in the steering, also it could be the bottom suspension arms. the garage should have checked these though! if the wheel is vibrateing then it may need the wheels rebalanced. if it is that you steering will shake at 60mph

check tyres for wear-wheel balance needed if visibly ok-have a wheel alignment after a tyre rotation-best even tyres to be put on fronts-they will carry out a safety check all suspension and steering before doing the wheel alignment