Repairing Shower Grout???

I know my shower grout needs repair .. and I didn't think it was going to be a big, time-consuming job .. however, in searching around on the internet .. I'm getting the feeling it's a bigger job than I thought.

Has anyone had any experience in doing this?? Any advice/tips/warnings/suggestions would be greatly appreciated!!

It's a huge pain in the a$$!

The biggest pain is digging out the old grout, which you have to do in order to be successful. Otherwise you are just covering the old stuff that is usually soft and coated in grime...which will make the new grout chip. Best advice is to make it a team job, at least 2 people to make it go faster.