Need some encouragement - 4 kittens, two are now socialized

Hi there, new to this forum and hoping it will be helpful.  I'll try to keep this short.

Mid June we discovered a mother feral cat had 4 kittens under our three season porch.  We had no way of getting to them but wanted to care for them.  So we started to leave food for mom and baby. Then we decided to work on catching them so we could socialize them to either keep or get adopted.  They were about 5 weeks old when we managed to catch two of them. It was sort of a blessing in a way as our cat of 14 years passed away last spring and I had been wanting to adopt a pair of kittens.  It was easy to get them tame/socialized.  They now have been with us a month.  We took them on vacation with us for a week as well.  

Meanwhile, we have been feeding the other two kittens, mom and two other feral cats. Someone even came by while we were away to put out food.  I had really hoped to catch them all right away and then catch mom to have her spayed and then released.  Well, I managed to catch a third kitten and it managed to escape!  But then three days ago I caught the other one who is now living out on the three season porch.  It won't let me get close without hissing.  I know that it will take longer to gain his/her trust as she is now about 8 weeks old.  I am hoping it's still possible to tame.  Thoughts?  Tricks?  

Also, these two caught fleas from I believe the one that I caught that escaped.  I had been trying to get these guys to the vet for weeks and called for an appointment for deworming and such when I discovered the fleas.  They gave me a pill for each to kill the fleas and I managed to comb them and bath them in dawn.  Thankfully their appointment is tomorrow.  Today they both have diarrehea and one vomited a round worm.  So thankful I have their appointment tomorrow.  

I'm still trying to catch that 4th and I'll need to clear these second two of fleas and get them dewormed.  I am feeling a bit overwhelmed and consumed at the moment.  I knew they'd need lots of care but man, I am tired. Do we think I will be able to introduce the 2 and 2 to each other at some point?  

Does this get easier or am I forever going to be feeding a colony of feral cats?

Congratulations!  You have been chosen for an important job.  Caretaking for a feral colony is hard work but well worth it.  It does get easier.  Spaying and neutering everyone is critical, but you already know that.

At 8 weeks, the two new kittens are well within socializing age.  After 12 weeks, it becomes a little harder but is not impossible.  We socialized two six month olds, so it is defiinitely do-able.

I would get the first two to the vets and clear their health.  If you plan to keep all four inside, you can tackle introductions once Numbers 3 and 4 are trapped and vet-checked, too.  If you plan to find homes for Numbers 3 and 4, the three-season porch is an excellent temporary home for them.

At the same time, continue to try to trap Number 4 and spend some time every day with Number 3.  He or she needs your presence to recognize that you are not a monster bent on eating him/her.  Sit with Number 3 and read outloud - it gets the kitten used to your presence and your voice.  You can use wet food (or Gerber chicken baby food) as a bribe.  But consistancy is the best approach.  Every day, the same thing at the same time.  Is he/she using the litter box yet?  If not, try putting a little dirt on top of the litter - it is what they are used to using outside.

You should also start planning the trapping of any others you are going to leave as outside cats (mom, any older kittens, etc.)  Providing them with neutering or spaying and then feeding them and building shelters for them is the best thing you can do for them.

Call around and see if there's a low-cost spay/neuter group near you.  If nothing else, they can help with the costs of the surgeries and they may be able to help with trapping, etc.

Thank you so much for helping these kitties.  They are in this situation because at sometime someone was irresponsible.  So you stepping up to the plate is really important.