Firstly it depends whether you have the felt bushes or the Elastollan ones. The felt reproduction ones are very thick and you need to soak them in a jar of oil for a couple of weeks before using. The Elastollan (plastic) are better but you need to modify them to fit your car. With the column on the bench insert the bushes and then the inner column. Usually it will be very stiff to turn by hand so you need to remove the inner column and gently ream the the bushes with a Dremel and drum sander bit. Re-insert and retest. Repeat this until you can turn it smoothly - remember with the steering wheel on you will be exerting a lot more force so go carefully. Test again with the steering wheel on the column. I do two quick orbits on each bush with the sander between testing.
What you are looking for when the wheel is in place is to have a slight movement of the column up/down/left/right to the point where you think you need new bushes. Worry not because as the car gets hot the inner column expands and takes up the slack. If you just try for no movement in the wheel before startup you will lose self centring and the column will squeak.
Allow a couple of hours for the whole process and be prepared to take the column apart again if you have not got it right. Do not use oil or grease between the column and bush. Personally I would avoid the felt bushes fitted to the earlier cars because you can't fettle them to fit and they are not the right size. On my FHC there were no squeaks with the felt but self centring was lost so I moved over to the Elastollan. Get it right and the steering is a dream.
Hint: buy a couple of sets of the Elastollan bushes because you will probably over sand the first set! On the positive side the Elastollan is very tough so they don't sand easily.