A well set up Land Rover will steer well and without undue effort. There off road ability makes them feel a little different to a normal car. It is a slow process to check and adjust/replace parts as required.
Check and adjust the steering box and make sure it is full of EP90 oil.
Make sure the steering relay has oil EP90 again, remove two screws from the top plate use one to fill and the other will bleed air. This is a common fault when searching for tight/vague steering.
Read the manual and check the swivels (big chrome balls) Make sure they have oil EP90 or one shot grease. Disconnect a track rod end and check the pull with a spring balance.
With the seals in place you are looking for a pull of around 14 pounds slightly more than book when done without seals in place.
Next it is a case of going through the steering joints to check for wear, grease them if they have nipples fitted.
Other things to check are the bracketry that bolts the steering box to the chassis these can come loose and give rise to wobbly steering, finaly check the top bush in the steering collom.
Someone will no doubt add to that list but enough to keep you going.......