I find taxes very hard each year, trying to figure out all my receipts for things I use for the websites I run. I gather them all up, put them into a spreadsheet, get the total, and plunk that into one of the 'other expenses' boxes in TurboTax.
I understand (I think) how to do that for things I buy to test - say a new type of bird seed to try out on my birds and write up. But for things like my office computer where they talk about depreciating it and such, I'm far less sure. I've never claimed my computer. Do you just take how much you paid for it and plug that in, and then each year it auto-deducts some portion of that?