Nothing special. Pretty much what I would do anywhere.
1. Research the item sticking to known manufacturers. Their websites, review blogs and especially forums.
2. Look around for what's available and inquire about pricing in several locations. I shop alone. I don't want translation and opinions from people who have not done the research I have and may be swayed by a good salesman.
3. Check Taobao and I look at the cost of the item in Canada and Amazon. This is for pricing info only. I use Taobao but not for gadgets.
4. Now narrowed down, back to research. Don't up-sell yourself by buying something cooler or with a lot of features that you won't use/need just because now you have a bit of knowledge. For instance with cameras, I'm not a pro photographer, I want great pictures but I don't need the top tier stuff at all. So I have to understand who the reviews are aimed at.
5. Ask questions of the resellers. For most of the questions, I know the answers. I just want to check their knowledge and truthfulness for the questions for which I don't know the answers.
6. Play with the items. Specs are usually pretty close for manufacturers within the same price-point, but how things feel is really important. For example, I don't like the really big screened smart phones because I type on phones with my thumb in one hand holding it in portrait. With the big phones I can't reach everything comfortably.
7. Bargain, bargain, bargain then bargain again.
8. Pull the trigger. Don't buy any extras, that can all be purchased on Taobao or just a few weeks/months later when you really know what extra bits and bobs you might want.
9. Buy something shiny for the wife/girlfriend.
10. Play with your new toy and, most important... never look at prices for it again.