this is a dangerous question because to someone with bad judgment and a poor head on their shoulders, my anwer is a death sentence.
since I dont know you well, yet, my advice is exactly what Stephan said. Ask yourself if you are ready to deal with anything that could happen? do you carry a first aid kit? do you have a flare or radio? without a buddy iwould never get in the water without those items. just because there are situations I cannot handle with just my hands and spear gear.
for example..if god forbid I were to start bleeding (shark or cuda strike, slip with my knife, spear accident) and didnt have a big zip tie ( i keep them in my kit) I could VERY EASILY bleed out duting my .75 mile swim back to shore. Now I am still in a lot of trouble with a buddy, but I was a lifeguard, and so were a lot of my friends and we are good swimmers. If I had to I could swim someone in and that would leave them to apply pressure to the wound and greatly increase their chances.
so the best thing to do is spend as much water time as you can until you are feeling confident AND mitigate as many risks as you can...use a plat so your catch is out of the water and there are less sharks, have a big float and a big flag, etc etc
above all be safe and have fun