You have a 'guarded' high spade to make your bid. Always strive to make the BEST lead possible. Poor leads and failure to 'card signal' normally result in mixed up communication and a failed partnership. No one enjoys going to war with a partner that doesn't think like a TEAM member. Your focus during the game needs to shift between the score and number of bags each team has.
Accurate bidding is imperative to the score.
There is a fine line between maximizing your bid and overbidding. With adequate practice, you will be able to determine the difference and master a higher level of bidding. Don't fret - if you are determined, you will succeed in overcoming this obstacle in time. For now, your job as a team player is to be in synch with your partner in knowing what is necessary to win the game. Partnership spades is all about 'teamwork'.