In addition to what the others have to offer - all of it good advice by the way - I add the suggestion to have your husband walk in front of you on the way down. NO, he is not the designated "road kill." There is actually a method to this...
Assuming he is a stronger hiker and is also using walking poles to help break or slow his descent, he will be your "safety" in case you do slip and fall. If he is in front he can at least stop your continued tumble or slide. This will minimize any boo-boos, regardless how steep the down incline. This also assumes you shout to him that you are falling...
Beyond learning how to use the walking poles to pace yourself on the level parts, and to help pull yourself up an incline, you should learn how to use them as extra "legs" to descend. Practice on stairs or steeper paths near your home.
Just as an FYI, A Florida friend of mine practiced climbing up and down on the only "hills" available to her in central Florida - high school athletic bleachers! It worked. She was 69 in 2013 and walked the
Camino Frances like a mountain goat.
The down hill procedure is easy. LOOK at the terrain at least one to two meters meters ahead to pick your route through the challenging bits. LOOK for a good, secure spot to place one of your hiking your hiking poles, like between rocks, on the soil. Place your down-side hiking stick into this anchor point. Shift weight onto the pole, as you step down gingerly. (This presupposes that your hiking poles are well tightened).
Use the second pole to balance or steady yourself. Be prepared to dig that second pole into the trail if you feel the first pole start to slide or slip.
I frequently use one pole for traction on the way down, usually in my strong hand. The other pole is allowed to hover over the ground as I descend, ready to stab into the soil immediately if I feel I am losing traction.
Related tip: rubber tips for your poles are a useful and respectful thing to do when you are walking in a village, town or city, or on paved surfaces. Most of use HATE the "click-clack-click-clack" noise that the standard tungsten pole tips make on paved surfaces. The locals are also not fond of it, especially early in the morning.
HOWEVER, REMOVE THE RUBBER TIPS when going up or down a steep(ish), unpaved (natural) incline. The extra traction offered by the tungsten steel tips biting into the ground can make all the difference. Put the rubber tips in a pocket and then replace them when appropriate.
If you do not have a pair of rubber tips, pick them up when you get to St. Jean or Pamplona. They are cheaper in Europe and most hiking poles use the same diameter tip. I use Leki poles and never have a problem finding exact fitting replacements. The pair of tips that cost USD 12.00 in the States will cost perhaps half that in Europe. One pair should last the entire trip.
Also, Alto de Perdon is the first day out of Pamplona. Use the rubber tips until you leave the paved sidewalks and suburban roads. Then reaffix them when you get to Puente la Reina, after the down hill stretch. I think the Hotel Jakue is the first place with a paved road after Alto de Perdon.
Mountaineers and climbers use a conceptually similar technique to "belay" others in the climbing string so they serve as anchors in the event one person falls. Walking the Camino is hiking. Sometimes the route up or down is more challenging than a literal walk in the park. However, it is all manageable with some forethought. It helps to have a stout fellow catch you if you slip. It has happened to me more than once. I have also "caught" a few people who slipped.
I hope this helps.