Give this workout a try, it starts nice and gently and builds up the intensity. Always concentrate on your form to maximise the exercise, control your breathing and work hard.
The difficult part of exercising at home is having the ability to push through the pain when the going gets tough. You will benefit more from your final 4 reps than the first 7/8, when you really start to feel the burn, this is when you have got to dig deep and force yourself to make 4 more reps.
Try exercising looking in a mirror so you can check your form but also so you can look your self in the eye when you feel like saying can't! Take a deep breath, grit your teeth and refuse to give up, record your results and always try to improve every time you attempt an exercise.