Give it time. Our house was disgusting when we bought it. Absolutely revolting. It took time and refinishing it was so disgusting I had my seasoned contractors gagging and I almost didn't want to move in. I think everyone has some moments of regret on every property they buy, but for most people this will pass.
We've been in our place three years now, and things are much better. My advice?
1) Recognize the shock of suddenly moving in takes some time to get used to. Don't panic and do things right away. Give yourself some time to settle in before you rush into projects. The exception would be projects that make a lot of mess and need to be done before you move in, but this doesn't seem to be the case for you.
2) Almost all the things we thought we wanted to do when we first moved in (aside from refinishing floors, painting, cleaning and termite tenting/rodent proofing) we were glad we waited to do. We changed our minds on what was a priority, and we also rethought which rooms would be used for what and where we wanted things. For example, I thought we would replace the bathroom vanity right away. Nope, just repainted it and have been living with it. It will probably get done on our next apartment rental turnover, and we put that money toward installing a dishwasher and washer dryer instead. We also bought some new furniture that better fit the needs of our space after the first year of living there, but again this would have been totally different if we had rushed in straight away to purchase.
3) Pick a room or two to live in and make those comfortable. Close the doors to the other rooms and leave them empty or store your boxes there. Do check every so often to make sure things aren't leaking or some problem hasn't arisen, but don't waste money furnishing or trying to heat these rooms. We bought a 3 bedroom one bath duplex with a back unit, and we only used and heated one of the rooms consistently the first year (except when a friend rented out the guest room for a few months). We left the back unit empty and unrented for almost six months while we got settled and figured out what we wanted to do. We are finally at a point where between the baby on the way and the additional pets and home office we now need and use all three rooms.
4) We had similar small jobs to you. Don't worry about getting people out right away to do the work. Just start getting estimates. You will find some trades people you like and trust and if you are flexible you can arrange for them to come back and work on your projects when they are between jobs or during slow periods. We often did this with plumbers on projects that could wait, and plan to do it with the painters and the AC/heating folks. You will learn when the busy periods are and when things are slow. If you don't know, ask and call back during the slow periods.
5) Consider bundling jobs. The deck work may also be able to be done by the flooring people to make a larger job. We scrapped some of our projects due to their being so small we realized no one wanted to do them for less than $1000+ bucks. Fine, we'll do some of the smaller projects ourselves, skip some, and bundle the rest to a handy man.
6) Make a list of things you want to do to the house. Then sit on it. Write them down with budgets and revisit the list every so often. You will find things change and you will be glad when unexpected repairs come up you didn't spend all your money on projects you later changed your mind on or decided weren't that important afterall.
7) Consider listing a room on Air B n B or a short term rental site. You can try out having a roommate without having to commit. They will also send out a photographer and you can see what your place would go for. Depending on your area you can also get foreign students. You don't have to have a roommate forever, but it's a quick way to bring in some extra cash for home projects, etc.
8) Get a pest control company to come look at the property. They can deal with the spiders, and give you a consult on any other issues of concern.