Ask your partner to offer less resistance until you have learned to perform the technique a little better. Again, ask your partner's cooperation. It depends on the specific capabilities of the individuals involved. The purpose of aikido isn't to learn to defeat other martial artists. Offense calls for offensive strategies.
Defense calls for defensive strategies.
However, a mimimum of two practices per week is advised. Naturally, aikido is best learned with a partner. However, there are a number of ways to pursue solo training in aikido. Even purely mental rehearsal of aikido techniques can serve as an effective form of solo training. Note that in some other organizations there are no colored belts below black belt.