Your system hair will behave the same way as growing hair once you stick something like a baseball cap onto your head.... tends to `flatten`it down... on occasions I`ve worn one, I always just refreshed it by misting with water and `fluffing`the hair up with a brush. You can easily get/use a little atomiser bottle which you can even carry about in a jacket-pocket for when you`re away from home or at work...... I often take one in the car with me....if I`ve been out in windy conditions and the hair gets `messed up`, I just mist with water once I get back in the car.
Let your hair grow out at the sides/back as winstonage suggested, and you could also order a very light-density system for your first order, so that people you work with, wouldn`t be as aware of your decision to wear...you could even order 2 systems -- one with a `starter` density, and the other with a higher density for when you`re ready to make the full transition. If you`re going for a very light density one , to `soften`the initial `look`, It would be an idea to order a blonde [colour 22] system and have Debbie colour it for you if you`re nervous of doing it yourself [you have to keep colour off / away from the lace or you`ll stain it permanantly] ..that way, there`s be no risk of knot-visibility with a very light-density system. That system can be sent to Debbie who can colour it for you and post it to you [there is a fee of about 35$ for the colour and shipping is a little more] Have a look at her site
http://www.splitendshairreplacement.com and click the `services link. It`s just a suggestion you might like to consider..... lace is generally undetectable to sight, but if you`re going to wear a very light density initially, it would need to have all the knots bleached -well, or they`d be noticeable...the easiest way, is get an all-blonde system and simply colour the hair to the required shade ..that way there`s NO chance of people seeing ``black dots``on your head.