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At 51 Xalgoz is incredibly easy for an enchanter. You can use one of his minions charmed or your 49 pet (if you're not adventurous) will be able to do it. Just lull the room and pull him back onto the ramp behind his throne but not all the way downstairs, you won't agro below or above but if you go too far you will. Use your level 4 mezz and chain stun him on casts. Make sure he's rooted and slowed. Also if you do decide to summon a pet don't do it right up against the wall, you'll probably summon it somewhere where it will have to warp and bring back a ton of mobs onto you.

As far as dungeon travelling, there are minimum 5 spells you should have up at ALL times if you're not familiar with it: root, single target mezz, aoe mezz, aoe stun, gate. If you want to properly fill that out, add a second aoe stun, invis of your choice and lull. Change things out as needed or where comfortable (at 51 you have tot which would fill out the 8th).

Toggle between 1st and 3rd person. Would be hard on a track pad though so invest in a $5 mouse. Take advantage of 3rd person to check around corners.

CON EVERYTHING

Keep your buffs up. Make sure you have rune 4 up at the very bottom of your stack.

Take advantage of terrain and obstacles for Los reasons. I can't tell you how many times I've avoided getting agro when exploring because I hid on the right side of a pillar or stalctite while a see-invis mob walked by.

Turn your volume up and listen to footsteps. Keep your eyes peeled and check behind you every once and a while. Especially when you're going through particularly mazey areas.

Lull see-invis in groups if you need to get by.

Lastly, just be patient and make sure you read maps. In the end, avoiding dangers is all about familiarity and if you rush it, you won't be familiar with where things wind up.