Steel dragons slayer

Hey guys! I'd consider myself a noob and am looking for some advice! I got a task to kill 35 steel dragons. I am an Ironman and worry that may be hard for me. My stats are 74 attack 78 str 72 def. Or if ranging/magic I have 74 range and 72 magic. What is the best way for me to go about doing this? I could skip it but I'm trying to save up slayer points to make my slayer helm and they have nice drops! Let me know what you guys think!