Should a Buddhist lay-practitioner schedule his/her daily life I'm currently considering making schedules for my daily life in order to counteract boredom and restlessness. Does anyone has experience with doing this and maybe can give me some tips? Is it beneficial and if yes, how strict should you schedule your day?
Routine is a good thing to have for a Buddhist, I believe. While this will vary person to person based on their circumstances, these are my suggestions to incorporate in a daily routine of a lay Buddhist. 

Throughout the day continue to 


maintain and develop the 10 skillful deeds. 
efface and prevent the 10 unskillful deeds.


http://www.accesstoinsight.org/tipitaka/an/an10/an10.176.than.html

These 2 items were recommended by the Buddha as daily contemplations, almost must haves in any schedule.


Recollect the 5 daily subjects of contemplation as part of the morning, afternoon or evening ritual
http://www.accesstoinsight.org/tipitaka/an/an05/an05.057.than.html
Perform this check in the evening. 
http://www.accesstoinsight.org/tipitaka/sn/sn22/sn22.101.than.html


Once a week keep the Uposatha practice: 


The Buddha's strong recommendation of this practice is found
here: http://www.accesstoinsight.org/tipitaka/an/an10/an10.046.than.html
Details of the practice is found here: 
http://www.accesstoinsight.org/tipitaka/an/an03/an03.070.than.html


There are many other beneficial contemplations and practices that can be incorporated into a routine. 

Do share your routine once you have compiled it. 

May you be happy -/\-