I think selling and paying cash for something a little smaller couldn't hurt. Even with low mileage, you would still be saving if you had a vehicle that had better gas mileage (plus you're doing all the healthy-responsible-environmental decisions that way too).
On the other hand, if you're just selling to trade up to a newer model, you might be doing yourself a disservice on fees/insurance.
You might be better off youtubing things as they come up and become more mechanically inclined. Certain maintenance can help keep a vehicle up to par.
Another thing to look around at is what kinds of trouble your model has... I had a vehicle that was notorious for transmissions not lasting after a certain point, so once I was looking at replacing it a second time, I got rid of it.