One "trick" I've used successfully is to cut a slot in the top of the bolt head with a hacksaw and use a flat screwdriver to help start and run down the bolts if they are hard to get your fingers on. Then once they are snugged down you can finish tightening them with a wrench.
Some people make a big deal of how Mustangs are so helpless in the snow. I've never found that to be an issue with the proper tires and a bit of weight in the trunk. Combine that with some common sense and careful driving and you shouldn't have any problems. Enjoy your trip.
Here is a tale of one of my winter driving experiences in a Mustang.
Years ago I owned a 1969 Mustang
GT with a 351W and 3-speed manual transmission. As my only car it was driven in all kinds of weather. In the winter I ran studded snow tires and put some sand bags in the trunk for added weight and to put sand under the tires if I happened to get stuck.
My grandmother lived about 3 miles out of town and her driveway was fairly steep and about an 1/8 of a mile long going up the hill. Four wheel drive trucks were still a relatively "new" thing back then (late 70's early 80's) and two of my uncles and one cousin had recently purchased one each.
Now pretty much everyone else in my family were die hard Chevrolet fans and I had to endure a lot of teasing and ribbing about my Fords. I had called to check on my grandmother during a winter storm and one of my uncles answered the phone. I was told, "You just better stay in town. The hill is so slick with snow and ice we couldn't even make it up here in our four wheel drive pickups and we had to walk up the hill." What was that? A challenge?
Of course I could not resist and immediately went out and warmed up the 69 GT. I didn't have any trouble getting out of my driveway and headed out to grandma's. When I arrived, sure enough there were three shiny new Chevrolet pickups setting off to the side at the bottom of the hill that was grandma's driveway. As I came upon the driveway, I shifted into second gear and made a long looping turn into the driveway, then being careful not to overpower the tires and lose what little traction, I had the Mustang and I just chug a lugged right on up the hill with no problem. Did I mention that there was no problem parking as there were plenty of open spaces?
I got out of the car and walked into the house. Of course the first thing I heard was, "It's sure cold walking up that hill isn't it?" To which I replied, I didn't walk I rode, you boys forget that I drive a FORD!" They all jumped up en mass and went out the door to see if I was telling the truth. I have often wished I had, had a video camera so I could have recorded their looks of stunned disbelief. Needless to say the teasing target switched sides that day and I thoroughly enjoyed every minute of it.