An aluminum filled crucible is going to be a lot lighter and cooler than for bronze with much less risk already. You want as complete a distributed grip as possible, and if there is any insulation on that grip to prevent a 'chill' to it all the better. Safety is of course of utmost importance, but if paranoia is a problem here, might be better to stay away from this whole area. This is considered by me to be a real advantage as everytime others are around the silliest and most unthinkable questions, inappropriate diversions, and acts of unsafe, un-understood bodily positioning seems to get thrown into the equation. This does nothing for me other than to distract.
Bottom line is to do casting exactly like a sports star.
Run the entire operation through your head over and over before you even start. Look for the things that could possibly happen, especially unexpectedly, and be prepared for them with instant alternate plans. Set up for the odd events that could be unwanted, and don't take unnecessary chances. Without a stressful approach, casting too can be fun.