You may prefer infusion instead of injecting. Theoretically it can be mixed with isotonic water. A large vein, a blue cannula and a fully open clamp. N may cause a painful injection. Lidocaine might help. These are just teroic information. I don't know if N isotonic water soluble.
My method is propofol. So I need an injection system. I'il do it myself. It's not a very difficult job. Electric motor, switch, potentiometer, battery, cables, and a solid rope. I have to inject 600 mg propofol bolus. Quickly. I'll be gone in 10 seconds, so I can't do it with pushing. So I need it but you can do it with infusion. It's not hard to put a cannula in the vein. I watched videos on Youtube. I did it the first time. You don't need a bolus injection. Better with an infusion set. The only problem is: N injection can be painful.