Done W.Mac Spire 3 times. The trail up (big cairn) leaves the logging road after 4 miles (2+ hrs) just after a big creek crossing, get lotsa water there. Ascend 3000' to heather benches, where trail levels and crosses 2 big creek gullies. Expect NO water this year in the first, and maybe none in the 2nd - last July we had to head up the 2nd creek for 20 min before finding some small springs/pools. The next water is 2 hrs further, so you better find some.
The descent below the notch is will be dangerous steep loose crap by now (helmets!), but if you stay to the right side by the wall going down, stay close together, or never climb above someone, no problem.
Ropes are not needed, you should stay on the perm, snow fields below the Terror Gl, but takes axes, esp. for the glissading.
This climb is a real haul but worth every effort.