Had a customer bring in an iPad 2 with a cracked screen. Only minor cracks compared to many I've seen.
Since most of the iPad screens I've replaced are completely spider-webbed, the screen removal was quite simple. Didn't have to spend hours with tweezers picking out tiny pieces of glass from adhesive. However, this was a previously refurbished iPad, and the company my customer had purchased it from had used the biggest adhesive strips I'd ever seen. I thought the front panel felt a little spongy around the edges at first, but didn't think a whole lot of it. However, once I was into the iPad I saw that the adhesive strips were hanging into much of the interior of the ipad, and covering some cables and areas that I've never noticed covered with adhesive. I was able to removed most of it without problem, being very gentle around the cables it was stuck to. However, it was pressed into a large portion of the cable leading from the power button, which is a very small and thin cable, This cable tore like paper when trying to remove the adhesive, adding to the relatively easy repair I thought I was having. Luckily my customer was understanding, and when I explained I had to wait for more parts and why, she herself said she had noticed the edges of this particular iPad felt different than her others.
My only advice here would be to be mindful of items previously worked on by others. Sometimes you can't know what you're getting into until you've got the device open, and sometimes the previous techs may take an easy and quick fix rather than a thorough job well done.