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I'll answer the question, but first I want to give you a tiny lecture:

You should learn how to READ bass clef. It is a clef that you will see so commonly on horn parts and many other types of parts (say, piano parts, or trombone parts, or when you have to read the tenor line out of a hymn book), it should simply be in your mental toolkit. The fact is, learning to READ bass clef is going to involve, for you, the same process as learning to TRANSPOSE bass clef into a treble clef. The more you do it, the less you'll transpose and the more you'll read. My point is a subtle one, that you need to adjust your mindset. Making it your goal to READ bass clef instead of transpose it WILL give you faster success.

Okay... let's get going.

Consider a piano part. It looks a little like this (forgive the "ASCII art"), and here's what everything means:

                G
|-------------  F
|               E
|-------------  D
|               high C
|&------------  B
|               A
|-------------  G
|               F
|-------------  E
|               D 
|      ----     middle C (ledger line below treble clef)  <----
|                                                             |these are
|                                                             |equal!!!!
|      ----     also middle C (ledger line above bass clef)<---
|               B
|-------------  A
|               G
|-------------  F
|               E
|7------------  D
|               low C
|-------------  B
|               A
|-------------  G

So the easiest way to get a grip on bass clef is to look at some piano parts. See how the treble clef (usually for the right hand) and the bass clef (usually for the left hand) run together and overlap.

Now then, if you need to "transpose" temporarily by translating bass clef stuff into treble clef, while you're waiting for your brain to get used to bass clef, here's what you do:

Look at that second space from the bottom in bass clef. It's low C. It looks like an A on the treble clef. Therefore, one strategy would be for you to pretend you're reading A basso horn parts: every printed note equals a note one minor third higher but down two octaves. For example, that "A" should be up a minor third to high C, but then down two octaves to low C. Or, you could think of it as an octave and a major sixth lower, but that's usually harder to think about.

A better strategy is to mentally draw another line on the bottom of the bass clef staff so that "second space A" now looks like a "third space C" on the treble clef. If you squint a little bit, it's not to hard to read your part this way. But then read it DOWN two octaves.

WHOOPS! What if it's "old notation"?!?!? That means that your bass clef part is written an octave lower than you're supposed to play. For example, that "low C" would be drawn two ledger lines below the bass clef, and you would play the one on the second space, which is the one a single octave below middle C! In that case, you should visualize this: that "second space A" is now supposed to be middle C, so you need to think up a minor third (to high C) and down ONE octave (to middle C).

WHOOPS AGAIN!! What if it's a bass clef part for another instrument? Well, now you've got to do some more figuring. The most typical thing would be for it to be a bass clef C-instrument part, such as trombone, tuba, or bassoon. (It's practically a law that anything written in bass clef is concert-pitch, but Horn in C parts with bass clef are one exception.) So now that second space "A" is supposed to be low C in concert pitch, which is double-low G in horn pitch, but most likely you're going to want to play single-low G in horn pitch because playing trombone parts in their same octave is just too ridiculous on horn. So that "second space A" should be a horn G below middle C. Easy! Think Eb horn down one octave.

Seriously, I think you'd be a lot better off getting yourself used to reading that bass clef as a bass clef. Especially when you have to deal with old notation or a part that isn't for horn in F, it's just too many mental steps to "transpose" bass clef. Maybe take a few weeks of piano lessons to help yourself get acquainted: children taking piano lessons learn bass clef just as easily as treble, in just a week or two.

Hope all this helps. Even more than that, I hope you'll take my advice and learn to READ bass clef. You can do it!