IMO that is the wrong attitude. Trying to accelerate your bodies flexibilty beyond its natural progress rate is unhealthy and reckless.
Your body will open up when its ready. Might happen quickly, might take a while. Let it do it's thing in its own time.
Develop a regular stretching routine and commit to that. You cannot undo a life time of rigidity in the body a time in a couple of 20 minute stretching sessions. It can take years to open up the body.
It takes time and commitment.
Try a yoga class. It will give you ideas for stretching and the prana (breathing) will help keep you relaxed and calm, and maybe less anxious to do the full splits in a short amount of time!
"Let your food be your medicine, and your medicine be your food"