changing serpentine belt and idler F53 V10

[STBRetired]

Bearing going out on serpentine belt idler pulley. Is it best to go at it from above through the doghouse on my Class A? Or should I go after it from below? I have not had a chance to look at anything yet. Just looking for advice from someone who has already done this.

[ndrorder]

Idlers are accessible from below. Had to access above and below to replace belt.