You don't need to be especially it literate to use a pump. You've got on the forum & posted a message so I think you're doing alright. If you can use a phone or a calculator you'll probably be ok with a pump.
If you are concerned the technology might be beyond you there are things you could do to see if your concerns are justified:
1. Get hold of a copy of "pumping insulin" a text book on how to get the most out of an insulin pump - gives a good idea of the kind of decisions a pumper needs to make daily
2. Identify what pump you would be going for, see if you can have a play with a dummy model at the clinic, download the instruction manual and read it
As for losing gadgets, if you get a pump that's constantly attached to you it will be fairly difficult to lose it!
Maybe discuss your concerns with the pump clinic and see what they think.