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I also have a 2006 325i E90 and have done the belt and tensioner change. On the Z4 it seems the core support is closer to the front of the engine, but remove the cooling fan on either car and there is plenty of room to make the repair. It is simply releasing the tension of the tensioner on the belt and removing the belt. You need a T60 Torx socket and breaker bar to move the tensioner. The new tensioner comes locked in the open position. There is a single bolt that holds the tensioner to the engine block. Remove and replace the tensioner, then reroute the belt, and release the tensioner to the close (tensioned) position.
For an experience home mechanic doing this for the 1st time would take 45 minutes following a proper DIY instruction. The E90 form has several DIYs on the subject.
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A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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