I did our 99, 7 years ago. As stated , took a couple hours for the first one and then two each day till I finish all 8 of them. I use a product call edgeteck super spacer from CLLawrence and order the products from dkhardware.com
The number for the sealant is 877
The edgetech super spacer is 1/4x3/16 66 foot roll and most RVs but very easy to tell the thickness. SS1431666BL
No pictures but there are many here that I sent them to. Hard drive crash so lost them. PM me if you need help , If a DIY very easy to do. Maybe $70 for one window and then $10 for sealant more per windows till you use up 66 foot of spacer.