I've got my first Nechryael task .. I wanted to try meleeing and chinning them so I can choose between the methods .. but .. how am I supposed to lure them so I can chin ... more of them ?

you cant chin them in slayer tower they have to be chinned in the chaos tunnels room, and you can lure them with bronze darts/knives, using grey chins may even profit for this task

There's a guide for this in the AOW I think. The author mentioned profiting with grey chins.

i highly recommend using red chins, you should still profit with reds because rune boots and seed prices have gone way up while chin and ppot prices have gone down.