So About Douching ....

Hey there, Looking for a bit of advice on douching. I don't own an anal douche so I just take off the shower head and squirt warm water up my ass. This process for me results in spending 15-20 minutes sitting on the toilet waiting for it to... be shat out. I find the experience quite uncomfortable - any advice on technique or tricks to perhaps make the process quicker and comfortable? Let me know x