Hey Canoedogs,
Good advice to check your lug nuts. I have had more than my share of problem flat tires in the bush.
If the lug nuts are on too tight, I also use a penatrating oil, but if you do not have that try Bug Dope (100% Deet Repex I think it was), I have had it work for me in the past.
I have used the hollow handle of a Jack-All many times as a cheater bar on the wrench and it works well.
Once I twisted the socket head off an X wrench and had to make a Sat. Phone call for a wrench to be delivered to me, that was expensive.
Twice my tire changing problem was due to not being able to lower the spare tire from under the bed of the truck, due to corrison in the lowering assembly. Once I had to call for a flatbed, the other time my helper had small enough hands that he reached in with my Leathernam and snipped the cable.
Mike