As a rule avoid an inclination to ruff in the strong trump hand.
Remember that the partner who doubles usually has trump strength, and do not strew his pathway with obstructions by forcing him.
It is unusually bad play to double when you need only an odd trick to win the game.
The card led by your partner is a message of his holding in that suit.
Many a rubber is lost which the prompt lead of a high card might have saved.
It is too late to force when the adversaries hold the remaining trumps and an established suit.