That's a tough question. It always seems like what we have to write (to please teachers or bosses) is more difficult and boring than what we choose to write on our own. One way to get around that is to make what you write very much your choice when you can. For example, if you have to write an essay about a country but would really like to write about what it's like to be a kid, ask if you can write about what it's like to be a kid in that country, or pick a country that you would really like to know more about.
Another trick is to give yourself plenty of time to think about what you're writing about. Don't even think about words at first; just learn or think about the topic. This step is a necessary part of the writing process (unless you're doing "stream-of-consciousness" stuff), so when you're figuring out how long it will take to write something, be sure to give yourself thinking time. I often find that during the thinking time I get interested in what I'm writing about.
When you're ready to write, one thing you can do is divide big writing jobs up into several smaller ones. You can do this by making an outline. Doing an outline may sound like more work, but it can be a big help when you have to write something that seems daunting (even if it's small). It lets you work on smaller pieces, which is a lot easier than attacking one big one.
It depends on the reason I'm changing it. Just swapping one tire for another is pretty quick. If the wheel has a quick-release hub, it only takes about five minutes.
If the tire is flat, then it's more complicated. I alwys spend a few minutes examining the tube to see where the puncture is and looking inside the tire to see if the guilty party (e.g., piece of glass or metal) is still in there ready to give me another flat. Then I have to patch the tube, which takes about seven minutes (one minute to roughen the area where the patch will go with sandpaper, another to glop glue on the spot and put the patch in place, and five for the glue to dry). Since taking the tire off and putting it on again takes about five more minutes, the whole operation takes 15 minutes.
The goats visit the laboratory every spring to gobble up dry brush and undergrowth on the grassy slopes. It's a natural way to reduce the possibility of fire in the hills (and keep the local goats happy). The laboratory, the U.C. Berkeley campus, and nearby Tilden Regional Park use the goats for this purpose. The goats are mostly Angora billy (male) goats, and they belong to Goats Are Us in Orinda, California.