Here is the thing. The instructions are all you need. My sense is that you want to know if there are short cuts or things to be concerned with. That tells me that you do not have a lot of experience in doing these types of modifications. I have over the years probably done 25 to 30 different cars adding everything from navigations systems to stereo systems to aftermarket electrical/electronic components. And I am still very careful as it is easy to screw things up. It is very easy to scratch plastic or break tabs that require the purchase of new components. You need to follow the instructions carefully and not skip anything. Volvo provides very concise information as to what is required. They have an expectation that the person doing the work has prior assembly disassembly expertise. It is time consuming otherwise it would not cost $575 for labor ($750-$175 parts). That equates to about 4 hours. My guess is that someone who has done it before will take only about 2 1/2 hours. If I did it for the first time I suspect it would take me around 5 or 6 hours as I am leaning as I do the job. Once it has been done you can try and figure out ways of doing things differently. But that only comes after you have done it a couple of times. From what I can see it is not a difficult job, just a time consuming job. What I have learned over the years: get yourself some tight fitting white gloves (cotton). Buy yourself some plastic prying tools so that you do not scratch things up. Get yourself some good quality screwdrivers of various lengths and sizes. You will also need various wrenches and/or sockets. Read the instructions several times from beginning to end to insure you understand visually what is happening. Don't skip steps. Don't do things out of sequence. Be careful when using force. Once you break a plastic tab it is toast generally. If you only do the partial you will probably not come back and finish it. Set aside 1 1/2 times the estimated time required. Take your time. If you have never done this type of stuff then I would not pursue, but have the dealer do it. As an example I added the trailer module and the wire harness on my car. I followed the instruction precisely. Even with the pictures they provide it is not often enough if you are doing the task for the very first time.
