Cutting granite with a circular saw

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Picked up the MIL's new fireplace surround and hearth this evening. Offered up the granite back panel and it's around 2" too narrow so needs widening.

A bit of googling suggests using a diamond tipped wet cut blade in a circular saw should be capable of making the cuts. Any top tips from those that have done this?

I assume the key will be taking it slowly, ensure the slab is well supported and plenty of water. Gaffer tape along the cut to support the cut and to stop chipping and a guide timber for a straight cut.

Should I looked to clamp a timber right up close the the blade on the good edge to further stop it chipping?

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Interesting, the problem I have with using an angle grinder is achieving a straight cut. Have a look here

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I wasn't so sure but have a look at the link in my previous post. I'm assuming decent wattage Circular saw would be required, think mine is 1500W so should be up to it? Like I said previous, I like the idea of using a circular saw over a grinder for control more than anything.

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Don't tell anyone, but as a result of many years of cutting too much off, I've now perfected a way of cutting more on

I'm talking abut the opening of course!

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Some good advice in here, based on someone else mentioning it, just remembered that I already own a twin blade wall chaser (I try not to think about this tool as there is nothing enjoyable about using it).

Whilst I am tempted to find a DIY solution and post back the results, I will initially see what someone will charge to do the cut for me. I have enough work with this fireplace without creating more for myself.