Well we have very little to go on like which mac you have year size wether it has an SSD how much RAM etc.
That being said if your model supports El Capitan it should be the same as updating for anyone else, could there be issues?? Of course, there can always be problems with OS updates and with old software that may no longer be compatible but mostly people have updated with little issue.
Yeah, it's 4 GB. I just was worried about it taking hours and hours or not working right, rendering my mac useless for the time being..Probably 4Gb that was standard on the 2010 MBP. The only thing I will say is that all the OSX updates from mavericks onwards have been tended to run better on a SSD than a normal spinng Hard drive, shouldn't be an issue though it should work fine.
If you click on about this mac under the apple icon at in the top bar it'll give you the details of what configuration you have on your mac.