Relaxation skills can be simply taking a deep breath and letting all of the air in your lungs out and consciously feeling your shoulders relax as you tell yourself its aaaaaaaaall goooood. Keeping things in perspective meaning that there are other things in life besides this one moment if this one moment happens to be what is causing you the most anxiety. Simply playing the game and going to the game can be stressful for participants if they are new to the sport. Butterflies are sometimes a part of the game regardless of the level you are playing at. The ability to relax and calm yourself will be an important skill as you are preparing for competition.
Weather we feel it or not, If we are anxious or tense, it will effect our physical actions enough to have an effect on our skill execution. Not to mention the psychological effect it can have when a quick decision needs to be made. Tension in our mind results in tension in our body.
Breathing is the easiest and quickest way to relax just before an event or activity such as hitting or a penalty kick in soccer. As you have seen, just because the net appears huge does not mean it is easy to hit it if you are anxious about the outcome. Try it when you are just watching tv. Take a big breath lifting your shoulders and feel how your body releases tension. It is that easy.
The ability to calm those nerves during an event or a training session or at any time will enhance not only your performance but also your enjoyment of your sport. From experience I know that being anxious and tense during competition can be just simply chaotic and un-enjoyable.
Try relaxation exercises as you feel comfortable and then record some of your experiences with strategies you tried. You will find that as you gain experience you will find it easier and easier to find relaxation in the times when you need it the most