Cover up the East-West hands here and decide how you would tackle four spades on a trump lead.
The best plan involves establishing dummy’s clubs, since setting up hearts would require good breaks. You cannot draw trumps beforehand, because you will need them for transportation, so you had better start on clubs right away. Planning to ruff two clubs in hand will fail against a 4-1 trump split. Thus, the best approach is to knock out the club queen.
After winning with the spade nine and cashing the club ace and king for a diamond discard, lead the club jack, pitching your other diamond unless East covers. West wins with the club queen and forces you with a diamond, but you carefully ruff high, preserving two trump entries to dummy. You then cross to the spade 10. If everyone follows, you can draw the last trump and run clubs, making an overtrick. If either defender shows out, you are still in good shape. Just lead winning clubs and later cross back to the spade ace to draw the last trump before enjoying the rest of the clubs.
Of course, if East ruffs in on the club loser, your task is even easier because dummy now has as many trumps as East. You can, for example, simply overruff and cross to a trump in dummy to lead the fourth club and ruff it. Then you go back to dummy in trumps to run the clubs. Alternatively, you can discard your second diamond when East ruffs in.
For the record, you can still survive drawing trumps at once, but you would need to be inspired to do so.