With your 5 iron take your address position so that your toes are
parallel to the wall. Place the club 20mm or 2 inches from the wall.
Start your back swing and monitor the path the club takes in relation
to the wall. Swing the club back a foot or 25cms and see that the
club is the same about the same distance from the wall you have made
a solid start to your swing. If the club head hits the wall or you
see it has moved well away from the wall you have some work to do
with this phase of your swing. It may be a faulty grip, a problem
with your posture or over active hands that cause the problem.
You can do the same with your putter, monitoring the path the putter
head takes in relation to the wall.