Question #1: What are your prospects for making eight tricks?
Answer: Not great! You don't have enough fast entries to your hand to ruff two diamonds as well as set up your fifth diamond. Therefore, you'll need to do something different with dummy's spade honors. And you must work on that suit immediately!
If you make the mistake of first playing the ♦ A and ruffing a diamond on the board before playing spades, you'll be in trouble. When you then lead spades, the defender will win his ♠ A and lead a second trump, removing dummy's last trump. You won't be able to get to the board, and will have no chance to win eight tricks.
Question #2: After winning the opening trump lead, what would you lead at trick two?
Answer: Lead your ♠ 2 and hope West has the ♠ A and leads another trump, you can win and play the ♦ A and ruff a diamond with dummy's last trump. You'll then be able to cash both the ♠ K and the ♠ Q.
If West ducks the ♠ 2, you will win dummy's ♠ K. Now, you will be able to crossruff. You'll lead the ♦ 8 to your Ace and ruff a diamond with the ♣ 7. You then ruff a spade to your hands, and ruff another diamond with dummy's ♣ 10.
If East has the ♠ A, you're going down. East will capture dummy's ♠ K and lead a second trump. You'll cash the ♦ A, ruff the ♦ 3, and cash the ♠ Q, but you'll still fall one trick short. Your only satisfaction will be in knowing that you played the hand correctly, giving yourself the best chance to make the contract.
Worth noting: West's excellent trump lead. When declarer's 2nd suit becomes trumps, an opening lead of a trump is often best for the defense. In fact, it is fair to say: When you are on lead against a partscore in a suit contract, seriously consider a trump lead.
Hand courtesy of Declarer Play the Bergen Way by Marty Bergen.