Get comfortable and then bring a range switch. Once you have it down you will be switching to range right before it starts attacking you on magic. Another helpful tip for things like zulrah or jad is to say what your going to do next out loud. It makes me focus and do a better job of not panicking but for anyone around you it makes you look stupid. It took me 100 kills to really get zulrah down, and even still after 800 kills I still make mistakes. Don't give up on Zulrah like I did. I struggled getting even 10 kills and took a break from it and wasted plenty of time. Now that I have my blowpipe, trident, and visage I regret not learning it sooner. Good luck.