Any top tips for changing straps?

I've been playing around with changing straps ever since I got into watches but I always struggle with cases that have no drilled through lugs. It's almost a guarantee that I scuff up the inner lugs especially if the strap has a snug fit. Any out there have any tips on how best to change straps without destroying the case or strap?

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Use some scotch tape to cover the lugs and then practice, practice, practice. 

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Get a good strap changing tool and be very careful. Some go so far as taping the lug bottoms. At least any damage is confined to an area not visible when worn.

It's almost impossible to go through multiple changes without eventually slipping.

Whenever I but a used watch I expect to see evidence of strap changes on the lugs. It's usually stated as such in the sales posts.

The advent of "quick release" straps has helped.

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Gettingthe right tool is very important. Burgeon 6767F is great, it has spatula, fork and pin ends, should cover most of your need.

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I am hella clumsy so I opt for straps with quick-release spring bars myself.

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Buy quality spring bars, especially with stiff leather straps you will invariably go fishing for the holes, and with quality bars you are likely not going to scratch up the lugs as much.