Vanos seal replacement needed? M54B25

I'm getting the valve cover gasket replaced and was just reading up on it. Several sites mention that Vanos seals should be done at the same time.

From reading a bit about it, severe temperatures are a big contributor to vanos issues, and we're in a fairly temperate climate. I don't feel like there's any problems with torque or MPG, but it's mentioned that it's only after replacement that people feel the difference.

Is this necessary/advised (specifically for M54B25 with 170k miles and no sign of it being done previously)?

If so, what's needed/what costs/is it something a non-BMW specialist indy can handle?

Labour costs on this will be big, I'd recommend doing it i'v done it myself and if you can follow instructions you should have no issue doing it at home allow yourself a day I think i'v a write up in my thread or on driver. Net besian have a great guide and seals kit cost about 40 quid if you don't intend to keep the car for at least another year or two I wouldn't bother

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I've had a look, but this isn't something I'd be comfortable taking on myself. I've asked for a quote, I'll post it up here when I get it.

Can anyone tell me how much I'd expect to pay for a VCG change (I have the replacement gasket) and vanos seals to be done (I do not have any parts)?