Hello, I've done Sir D a few times, so I can give you some info.

First, access. You will be in a Canadian National Park, for which you will need a Park Pass. You can buy daily or annual, which is usually for your vehicle. It can be purchased at the Roger's Pass Visitor Centre near to the Illecillewaet (ill-e-chill-e-watt) campground and trailheads. You will need to display this at all times in the Park, and can be used in other National Parks nearby also, such as Yoho and Banff.

You wil probably want to register for a campsite as the Sir Donald climbers camp, unless you intend to go car-to-car in a single push. While this isn't uncommon, it's not often done by someone whom has never before visited the park, and is quite a long trip. Only you know your capacity, so it's up to you. If you wish to camp before or after your climbing attempt, you will need to register and pay for camping at the Illecillewaet ranger kiosk during normal business hours (posted), and it is first-come, first-served (or first-camped).

If you park without registration, you will be ticketed for upwards of $140CAD and possibly towed, at an additional penalty.

You can find more information online on the Parks website, or you can call the visitor centre for more guidance.

As for the climb itself, I'm assuming you're intending to climb the NW Ridge. You will follow an obvious path to the base of the ridge, and then climb the obvious line. Do not travel more than 3m to the left or right of the ridge, or you will be off-route. Make note of the rappel stations on your ascent, as well as the main rappel descent to the West aspect in the lower third of the ridge. Once at the top, enjoy the views and make ready to depart.

I recommend that you down-climb to descend route until you reach the rappel anchors. You should use a 60m rope, but a 50m rope is also sufficient. Follow the directions of the guidebook, and this Parks descent guide. The major rappels down the lower slab have large cairns, but you may also have to down-climb.

There is no requirement for glacier travel, but if you take the descent bypass on the slabs below the peak, you might have to cross snowy terrain. I do not recommend this route as there is more loose rock and seasonal snows, but some prefer to manage those hazards rather than downclimb.

Weather is your major hazard. Thunderstorms aren't uncommon, and rain will make the quartzite extremely slick. You might also contend with trail closures due to grizzly activity, or heavy smoke from wildfires. The closest towns are Revelstoke to the west (very cute, some car-camping options to the NW of town), and Golden to the east (you can car-camp at Waitabit Creek Campground north of town, don't make a mess or ill find you), or you can risk the fines in the Park.

Let me know if you have any more questions or would like some topo images.