The steering wheel needs to be removed. You will also need to remove the instrument panel first but it is very easy. You first remove its plastic surround by pressing on its sides and pulling it out. The rest is simply unscrewing and unclipping apparent screws and clips.
Main thing is anaything that needs pulling too hard will probably be secured by a plastic clip somewhere daft. I can't think of any nasties other than the one Angel suggested. You often find the instrument surround clips broken off.
For the post '83 Renault 4s the dash panel is supported by two plastic clips and two bolts. Remove the bolts and knock the dash upwards to release the clips.