Hi Guitarmaster, welcome to the forum!
I would DEFINITELY recommend you take a week off work to give yourself a bit of time to adjust to the hair system before you return to work. This is what I did, and it was very helpful. I used to use hair concealers - a combination of hair fibres and concealer powder, until it got the the point where I was no longer happy with the results and I decided to switch to a hair system. When I returned to work with my new system, the only thing people said was 'you've had a bit of haircut' (as the system was slightly shorter than the hair length I had before it), or 'ah, new hair!' and then everything just carried on as normal and nobody even batted an eyelid. Someone even remarked that my hair 'looked like a rockstar' (as I have longer hair and am a rock musician). It's like one of the previous posters said - if the system is done right, they will know something is slightly different, but won't quite be able to place what it is.
You will naturally feel very self-conscious at first until you get used to wearing a system. There is also a learning curve in terms of the types of systems available and the specs of them, plus the maintenance - looking after them, detachment, cleaning, attachment etc - but once you get used to it, it will become part of you and you won't look back. I suggest you read this thread which has a list of great resources, tutorials etc for people who are new (or even not so new) to hair systems:
As for the density, it does seem that most stock systems tend to be medium light. However, once you've got the unit cut in and the hair shorter, the density might be ok. If not, you can thin the density (or get a hairdresser to do it) with a hair thinning comb.
Your other option is to get a custom system, and some companies are still offering them/some aren't (my current UK supplier is, albeit with a longer wait time due to the pandemic). If it's possible, before you buy your first system, go to a stylist who specialises in hair systems, or have an in person or video consultation with a hair system company. Or if that's not possible then you can email some photos of your hair to them. Show them what your hair looks like with the concealers, and without them (so they can see the balding/thinning area which needs to be covered - you will probably need to shave this area before you can wear a hair system). Ask them the right questions on density, colour matching etc.
Then once you've got your first system, study all the resources in that post I linked to above so you can go DIY with the maintenance, then you can take control and save yourself the time and money of having to keep going back to a salon for detachment/re-attachment. (Of course, you might prefer to go to a salon to get the system cut in - although some hair companies can pre cut a hair system from photos).
Also, don't expect your first system to be absolutely perfect as it will take time to tweak things and know what you're doing, but by getting professional advice at first you can minimise the difficulties in the initial transition phase.
We will be here to support you should you have any further questions or need any help as you go along your hair system journey. I have been wearing for just over a year now and although it was a painful start for me (both with getting my first system right and with the mental/psychological side of wearing), I eventually figured things out and got used to it. Getting a hair system has been one of the best decisions I've ever made in my life, and has totally transformed my confidence. So I say go for it if you feel it's the right path for you.
