I use Internet Explorer and make sure it is set to remember what I fill into forms. This way, for the reports that are mostly filling in forms, I can click the field and it will bring up all my previous responses. This helps because I am boring and always order the same thing and it almost always costs the same price.
Of course for anything with narrative, you need to type in each time. I do one shop regularly that takes a lot of narrative. I always pull up my copy of a previous report in Word and edit it, rather than start from scratch. You need to make sure you change it up a bit, but it makes it easier, and your format will stay consistent.
On some shops when you have to scan a lot of material in (one bank in particular comes to mind), I will multi-task and work on the report as I wait for the scanner to do it's thing, or edit the scans for one report while I scan in a batch for the other. This may seem obvious to the experienced shopper, but it took me a couple of months to get comfortable doing this. As a newbie, you might get too confused trying to do more than one thing at a time and make mistakes, so don't rush yourself.
Once you are more confident, give yourself a goal for completing a report. I think to myself, "If I finish this report in ## minutes, I will be earning $$ per hour." That kind of attitude helps me crank out more in less time. I think back to Napoleon Dynamite at the chicken farm: "That's like a dollar an hour!" I definitely don't want to be there!
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Could I have a receipt please?