Hi I own as specialized secteur triple with a shimano 2300 setup! I was gonna trade in the bike and look at a new one but have now decided it's maybe better to upgrade! Is this easy to do? Any advice on which groupset to go for welcome! Was thinking tiagra as I really don't have much money to spend! Should I buy 2nd hand/eBay or go to a bike shop and get it fitted while I'm there? Any advice welcome! Sorry this is a bit vague but I really not too sure what to buy!