Any DIY repair of an iPad is risky. If you search on YouTube you will find many DIY repairs gone well....and not so well. Regardless of the result the process of disassembling and reassembling any iPad requires a skill set I certainly don't have. My poor vision alone is reason enough to never even attempt a repair myself.
I've also heard of quite a few members who have had their screens replaced now having trouble with their wifi connection as this is very easily damaged during this procedure. Having this done by anyone other than Apple will also void your warranty, but that being said your warranty is also voided from dropping it.
The IPad Forum is a community of members from all walks of life and from all over the world coming together to share our experiences and to help each other learn about this wonderful piece of technology the Ipad. There is a wealth of information already here in the many threads we have so doing some searches will answer most of the questions you have. If then you cannot find the answer you are seeking then by all means post your question. There are many friendly and informed members here only too willing to help you.