You're very welcome, happy to help, and you've got good advice from Kelly.
An extra spool can be helpful for carrying extra lines. A double taper might be a bit easier to roll cast--- but if you have a floating weight forward already, you might want to consider getting a weight forward sink tip instead--- you might find that being able to get down and fish different levels in the pond might be a better addition since you have a floater already. (You should still be able to roll cast with a weight forward floater although it might be a tad more difficult than with a double taper floater.)
IMHO, a sink tip (with a 10-15 foot sinking tip on the end of a floating line) will be a bit easier to manage if you fish ponds/lakes wading from shore, or fish moving water (streams etc) as opposed to a "full sink" line where the whole line sinks (no floating portion). The floating portion of the sink tip can be mended in moving water, and will help prevent the line from dragging on the bottom near shore on the retrieve. (If you fished mostly deep water ponds/lakes from a boat or tube, a full sink might be a better choice than a sink tip.)
And i hear you about changing flies--- especially in low light.
Now that I'm an ancient relic I have a hard time threading tippet through tiny hook eyes. One thing that helps is a fly threader like these from C & F:
They come in various sizes and come as a set of four threaders for 17 bucks or so. I'd probably get the midge size since you can use it on medium and large hooks too. Although the midge size is more delicate because of the thinner wire, the larger size threaders have thicker wire that might not fit a small hook eye very easily.
C & F also sells fly boxes with threaders built in, but they're expensive:
Hopefully you shouldn't have to change the actual leaders too often (as opposed to sections of tippet at the end of the leader). But sometimes tangles happen as you're learning that may call for changing leaders.
To make things a bit easier to change leaders at least for now, you may want to consider adding a loop to the end of your fly line--- you don't have to do it right away, but the next time you change leaders, instead of cutting the fly line and retying a nail knot, clip the butt section of the old leader and tie a Perfection Loop in it, leaving about 3-6" plus knot of the old leader attached to the fly line. You can tie a Perfection Loop like this:
Perfection Loop | How to tie the Perfection Loop | Fishing Knots
Tie another Perfection Loop in the butt section of the new leader (if it doesn't already have one) and attach the two sections with a Loop-to-Loop Connection:
Loop-to-Loop Connection | Killroys Fly Tying
The loop to loop connection might "hinge" a bit at the connection, and tends to pick up a bit more weed, so I prefer a direct connection to the fly line (I use an Albright Knot instead of a Nail Knot), but it's a very easy connection to make if you find you're changing leaders a lot.
Hope this helps..