I'm having power problems with my VT750DC.

About a year ago I had the valves adjusted. Since then it has trouble taking off. It likes to stall out and when you restart it and give it some gas, it will usually be fine. I started using high octane gas and was then told that I shouldn't be using that, I should use the regular stuff. I've tried additives to clean out the carbs, with no success. This weekend I went out and all of the sudden I lost power and couldn't get it restarted. I checked the gas and found that I had enough in the tank. I started it up and continued down the road. Soon after, it died again and this time the battery died while I tried to restart it. I had some friends look at it that know a little more about bikes than me and they thought it could be a number of things, but I'm thinking the carbs need to be replaced or cleaned and that the fuel filter should be checked. Any thoughts? And how hard is it for someone with some knowledge of the bike to fix it?