Here are some tips on how to hold the camera to prevent shakes:
1) Perfect how you hold the camera: use both hands to hold the camera firmly, make sure your hands are always close to your body and try not to strain. Keep your elbows together, keep your legs open. Exhale completely before pressing the shutter. If you still have difficulty, try leaning to a wall.
2) Lay down: if the photo you are planning to take can be taken in this position then you should lay on the ground and let the lens sit directly on the ground.
3) Rest your elbow on your knee while in a seated position: if you are seating to take the image, rest your elbow on your knee, this will help create a balance like what a tripod will do. Use your other elbow for support.