Swapping worn rockers

I've got a new set of rockers, shaft and bushes for my engine. They keep going out of adjustment quite quickly and there are burs and flats worn on the valve contact area, after all the time and money I've spent I might as well get this bit right.

Now, before I try this, if I take out the bolts holding the rocker shaft down, without removing the other head bolts will this knacker my head/gasket?
Am I best:
- getting a new gasket and redoing it (PITA)
- slackening all the bolts off and redoing the sequence (without replacing gasket)
- is there another way of doing it "quickly".

I'm guessing it will be too much to hope to be able to slide out the rocker shaft without undoing the head bolts....

Cheers D

id risk just undoing the five bolts and retightening the 5 from center out

Thanks James for the reassurance, don't want to bend that head...cost a F***ing fortune! Will try and give it a go tonight...if I don't spend all night tracing the scary clunking noise that started yesterday!

I did this the other day. S3 book said torque the lot in the original order. No mention from what I remember of loosening the others.

I simply tightened the rocker bolts from the centre - outwards progressively.

Smart, thanks both, looking forward to a clatter free trip this weekend...