“Pretty handy” around the house is completely different from being able to do a house flip on your own with no subcontractors. I do not want to discourage you, but please start out with a small project containing a limited variety of chores. You will quickly find out that many tasks require two people for safety or logistics reasons. As my husband always tells me, “Someone has to hold the dumb end of the tape measure.” If you are going it alone, make sure you have a helper, if only to hold the ladder or call the ambulance.
Think back to all your personal home improvement projects. Did they all take far longer than you thought? Were you required to make several trips to the store to buy more screws, select lumber, or rent specialized tools? Things will not be any different on a house flip. Pick those jobs for which you already have a good supply of extra small parts and fasteners and the specialized tools you are likely to need. For everything else, it is probably cheaper to hire it out and sell the house more quickly than try to do the work yourself and delay a resale.