Alterations on waistband

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Several of my skirts have elastic waistbands that are either too tight or too loose. What would be the simplest, best way to either just expand or decrease the waist? I would think it'd be by either cutting or expanding the elastic of the waistband. Is there a way to do it without taking the whole elastic out? By just opening a side slit and working from there? Also, could this be done by hand? I prefer working by hand for something like this. Any help would be greatly appreciated! If you'd like, you can email me at gbrite35-adverts@yahoo.com. Ginette B.