Ok, so today I was just riding along when due to my own stupid fault I fell. What happened was I had just adjusted my saddle height and was concentrating on my pedal stroke to see if the saddle height was better. I was not concentrating on where I was going and was slowly veering to the left. My front wheel went off the left of the bike path. I would have been fine in any other situation other than the fact that the bike path was around 10cm higher than the grass next to it and with the back wheel still on the bike path and the front wheel off the bike path, when I tried to get the front back on the path ... you get the picture. I stacked it pretty hard. What's more is that now the two shifters on my relatively new and shiny (and first) road bike have massive scratches on them

. Lucky there was no one around to see me fall ... Anyway afterwards I got up and checked the bike. Luckily i did not start riding straight away, because when I was testing all the gears I found that it shifted really badly and when the rear derailleur was in the innermost ring the jockey wheels would hit into the spokes. So know I have got a couple of questions. (it is a replaceable hanger)
1. I know that the derailleur hanger is bent but how would I know if the derailleur itself got damaged as well?
2. I would really like to ride the bike tomorrow so am thinking of bringing it to the bike shop to get it fixed. Is fixing a bent derailleur hanger a really easy and fast job, like one where I could get it fixed while I wait? How much generally should fixing a bent derailleur hanger cost?
3. I was thinking about buying a Park Tool DAG-2 to fix it myself but then I would have to wait a week for it to be delivered

. Anyway are bent derailleur hangers really common? Do you think it is a good idea to buy a derailleur hanger alignment tool to use in the future? For those that have a derailleur hanger alignment tool, do you find that it is something you use regularly or something that just sits there collecting dust?
Thanks for your help,
From a very sad and annoyed cyclist/bike rider.