hello, i am new here so please bear with me if i do not make the slightest bit of sense! 
just wondered if i could get some much needed advice as my car is due for its service & mot & i am aware that there are a few things that will need attention. I dont want to look totally clueless at the garage & risk getting ripped off! (no offence to the nice garages out there!)
i have had my 2001 (xreg) punto for almost 2 years now, its got 39000 on the clock.
1. I had part of my exhaust replaced last year due to a hole that caused it to sound like a racing car! There have been no further probs until about a month ago when i thought i had a cats tail hanging out of the exhaust! i have been told that this indicates that the (?)rear box needs to be replaced? is this right & if so how much should it cost roughly?
2. I had 4 new tyres fitted last year, all but one seem to be doing ok - the driver side front tyre seems to be more worn however this may be due to the slow puncture??
3. Think the brakes are on the way out - how much roughly?
sorry to be such a girl but i just have a bit of garage phobia!
any advice greatly appreciated

just wondered if i could get some much needed advice as my car is due for its service & mot & i am aware that there are a few things that will need attention. I dont want to look totally clueless at the garage & risk getting ripped off! (no offence to the nice garages out there!)
i have had my 2001 (xreg) punto for almost 2 years now, its got 39000 on the clock.
1. I had part of my exhaust replaced last year due to a hole that caused it to sound like a racing car! There have been no further probs until about a month ago when i thought i had a cats tail hanging out of the exhaust! i have been told that this indicates that the (?)rear box needs to be replaced? is this right & if so how much should it cost roughly?
2. I had 4 new tyres fitted last year, all but one seem to be doing ok - the driver side front tyre seems to be more worn however this may be due to the slow puncture??
3. Think the brakes are on the way out - how much roughly?
sorry to be such a girl but i just have a bit of garage phobia!
any advice greatly appreciated