Yes found that last night . I was approx 3mm out

I used the rear of the camera as a guide figuring the sensor is within a centimetre of the rear of the body.

Well done, onwards and upwards

I shoot most of my work using centre point and recompose, I don't know of any quicker method.

As for the consequential loss part of your contract, yes there is no problem with that, however from a customer aspect I would be concerned with my photographer falling ill and not having any photographer turn up. I know a few photographers who would be able to fill in for me as I would then. I think this is a little irresponsible and could be detrimental to your business. Always always have a back up plan.

Say you where ill on the day, you call the bride and say sorry I'm ill, I won't be coming to cover your wedding here's a refund.

That's not going to go down to well is it. A quick letter from the bride to the paper even worse she posts it on Facebook, your business is finished and for what?

All photographic subjects agree to assist the photographer in making images possible. The photographer is not responsible for subjects who do not comply with photographers request essential for making of the images contracted to supply.

I have something along those lines in my contract, I will dig it out over the weekend for accuracy. It's proved useful, during one wedding an auntie point blank refused to smile or look at me and insisted on keeping her eyes closed insisting she didn't want her photo taking, which was fine and was her prerogative, however this was one of the photos that was important to the bride. I pointed this out to the bride during the formals asking her to intervene but she couldn't convince the aunt to comply with my requests.

Neither it's 800mm fov on 35mm
On crop 1200mm fov
On q I believe it's 4400mm fov if my calculations are correct...

Here's how I test my focus as recommended by rice high. I found this last week when looking for other methods.
For the 50-135mm the following;
I have a kitchen work top 3 metres long, at one end of the worktop I put a cereal box, the other end my camera.

Put the camera into live view mode.
Half press the focus until it focuses on the cereal box.
After the camera has confirmed focus check the focus window of the lens
It should be reading 3 metres on the lens focus point, if not adjust.
When it's reading correct pixel peep the photo
For my da 16-50 and f50mm I use 1 metre point.

I find this far more accurate than any ruler, tripod method etc...

Yes most photography insurance cover has indemnity built in...

On your contract you need to cover yourself for unhelpful family members who refuse to comply with your requests making photography impossible.

Is the hp the g6 laptop? If yes you also need to invest in an ips screened monitor around 23 inch, this enables accurate colour rendition, particularly if you are providing just cd/DVD for e couple to print themselves, you don't want to have to reprint their prints because of poor colour tones.

As I understand from your posts the weddings you have done so far have been for free and for friends, paying customers are more demanding and not as forgiving.

God luck with your new venture it's hard work but very rewarding

Oh and as blythman says public liability insurance and get some proper contracts drawn up for your clients to cover yourself for every eventuality.

Oh and of course a decent speed computer with Lightroom or aperture depending on your computing choice.

Wedding photography is not something that can be done on the cheap and I cannot stress this enough.

When is your first booking?