Spanish naturalization application process

My apologies if this question has already been discussed elsewhere. I was not able to find any topics on this subject.

I am reaching the end of my residency period in Spain and will be able to apply for citizenship. Unfortunately, I will also be heading abroad for two years to pursue a graduate degree in another country. Does anybody know how the process works in terms of having to actually be in Spain during the 1.5-2 year application process?

I understand that you have to be in Spain in the 10 consecutive years right before the application for naturalization, which I have done and so will be applying for citizenship right away before I go back to school. If I am not allowed to leave now for schooling during the 2 year processing period, I can't imagine having to restart the 10 year residency period after I come back! If necessary, I can fly back into Spain whenever necessary, but I have heard rumors (haven't been able to confirm or deny) that there are random home visits and interviews to check that you are actually a resident in Spain during the application process?!

Any input on this issue would be greatly appreciated! Thanks!

N.B. If anyone can recommend an immigration lawyer that would be able to help me do the application process while I am out of the country, that would be very helpful too!