Originally posted by miltona580 Yeah I really can't use a tripod. It would be too distracting, and block aisles.
There are many support alternatives like the string monopod. There are mini tripods (one of my favorites is the Tamrac Zipshot, very compact but still a good height). Leaning on a wall, bean bags, etc etc. Practice to see how low you can go with your shutter speed without a real tripod.
Originally posted by miltona580 For denoising the pictures, is Photoshop with a plug-in the only choice?
You don't need Photoshop but at least an application that is compatible with Photoshop style plug-ins. A cheap one is Photoshop Elements, 90% of what most users need from the real Photoshop at a fraction of the price.
For the plug-in I'd recommend Topaz Denoise.
Lightroom does also a good job and you don't need Photoshop to run it.
There maybe free or open source alternatives but I don't know those.