Honestly, Taking ur car to a mechanic for this problem is laughable, even for the most non mechanically minded person, coz this is so ez to do. As u saw its only a matter of a few bolts and pull off the overflow hose. Don't kno wot size socket u'll need as i dont have ur car. But a rough guess would b 10mm, but just go thru ur set till one fits. Check eBay etc for new bottle. Don't buy anything from rip off dealers untill u have searched EVERYWHERE else first. Same goes for all other mechanical work. Wreckers are as big a rip off as the dealers. Keep ur old coolant to re-use coz u said its new, unless it looks dirty in some way. Don't b afraid to attempt most anything, look well, take pics if ur memory isn't the best and go for it.