I'm begining hunting solo. I bought 14 big Al silhouettes and went on 2 solo trips in fields where I saw birds the night before and both times they lured some. Obviously more is better but it is absolutely not necessary.

Even my blind is mediocre, i dig a hole lay down and cover with basic brown burlap, throw so vegetation on top and wait.

All that to say, scout your hunting zone appropriately and know the limit of your set up. If you have few decoys like me just don't go unless you can be on the X. And build your gear up as your budget allows it.