I agree with Doug, until you've done it the first time, you don't know how difficult it is, if you will smudge or scratch things nor how much better you're seeing will be. So its alot of unknowns and if ou're risk adverse you stop there. Personally I reckon get these folk (self included) to a star party and have a session where someone with expertise shows you the answers to all these things, then we could pass on these learnings too!
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