I prefer computer spreadsheets but you may still like handwritten ones much like me continuing to use my paper time planner. Do whatever works for you because it really does not matter which method you choose as long as you commit to finding that number. You can go back later and add in purchase details if necessary but for now just find out where you stand. This will give you a sense of control over your assets. If you have not done this in a couple of years be prepared as the number will most likely be down significantly unless you have held your money in cash equivalents.
If someone else keeps track of your investments whether it is a family member friend or financial professional set up a meeting to review your assets if you have not done so in the past 6 months. Let him or her know that you would like to receive updated copies of your investment summary each time it is updated or at least quarterly. While you are at it inquire what a reasonable investment return expectation would be one year from now based on your current investment portfolio. Do this and notice how much more in control you feel afterward. Even if your portfolio is down which it likely is knowing where you are is imperative to financial empowerment.