I too had some of the same concerns as you have. I have been here in Doha since April and pretty much have found nearly everything I need as far as toiletries and such. I was pretty surprised at the familiarity of items and thought things here would be more difficult.

Not to sound funny, but bring your good defensive driving skills, since driving in Doha can be challenging and bring a good attitude becaue I have found many impatient, inconsiderate people. I have also met some of the most helpful people, so it balances out.

Except for the heat and humidity, you should find this country a safe place to live. Good luck on your journey.