I can do them, bodyweight, weighted, and even jumping.
There are a couple of exercises that you can use to help you achieve a bodyweight pistol.
In no specific order several are:
- Negatives. I honestly believe that negatives were the single most effective and beneficial exercise that I used in developing the pistol.
First try lowering a little at a time, trying to hold different positions along the way down.
Once you can stop yourself at any point along the descent try lowering yourself as slowly as possible under complete control the whole way.
Once you can do a very slow, completely controlled negative, try doing a regular rep.
The exercise that you are currently performing, also make sure to stand back up using the hands on the doorway for assistance.
Attach a single handle (the type used during cross overs) to a high cable. Do free standing pistols using the handle for assistance. This is much more challenging in terms of balance than the doorway exercise, while also having the benefit of allowing you to know exactly how much assistance you require to perform the exercise.
Over time slowly reduce the amount of assistance until you are performing reps with minimal assistance (depending on the cable stack it might be around 10 lbs of assistance). When you can do that try doing an unassisted pistol.
Other tips that can help in terms of balance are to try the above mentioned exercises barefoot and/or on a soft surface (like a stretching mat). The added instability will force your ankle and knee stabilizers to work over time thus improving your balance.
Also don’t forget to do regular barbell squats to continue to increase maximal strength.
Hope this helps.