You sound like me as I use guns for protection as my dog(s) passed a while back, and I was raised hunting and on a farm part of my life and on farms and ranches guns are just very normal for various uses.
I think alarm systems are 1) too complex and expensive; has to be installed and maintained; 2) just seeing someone creeping around the outside of MY home sets my heart racing, and I've had to call the police before, and that is worthless; not offense to the police, but they have work loads and priorities and you or I may not be the #1 priority over that four care pileup and they won't get to you for 45 minutes! 3) A camera/alarm setup is JUST warning, NOT protection - even if it does call the police for you, what is the priority order of their calls that busy Friday night at 11pm.
I don't want to scare anyone but: my grandmother was raped in her home, after grandpa died. She was 81. She was half deaf, wasn't wearing her hearing aides and didn't hear him come in the back window. After that, she owned a doberman guard dog my Dad bought and trained for her.
Burglars are 98% men, rapists are 100% men to my knowledge. There is only THREE things they are there in your space for: something they can steal and sell; looking for drugs; a sadistic rapist looking for a victim - they do not care your age.
You do not know why they are there, so assume it is rape, when alone in your home; you need to THINK that, it will make you more brave at the moment and keep you safe in court.
I always think I must shoot to take out the threat of physical rape; it is personal; and it gives me determination.
As for me, IF my DH died, and I was then living alone, I would keep my gun bedside which I already have, AND train myself a good guard dog or have someone train (him) for you. Male dogs (such as golden retrievers, doberman, German Shepperd, Malanois, Vizulas are are uber protective of women who love them and they feed off your emotions and seem to know exactly what you are thinking. I love training dogs, as my father did.
My DH is a firearms instructor and has many young women as well as much older women in his classes on a steady basis these days.
I often help him at the range and ladies sometimes relate to me more than him on the range when I help them with the fear of the gun "just going off" on them. I teach them that it isn't just going to go off...you do have control of it once you learn to love shooting. It gives you a sense you CAN handle a nasty situation, it gives you "muscle" power equal to a man or even better, to protect YOU or loved ones.
Loved ones: ALWAYS, if children are near, have the gun in a locked finger ID bedside case. Your fingers know the keys, to code in a code; the kids don't figure it out.
The only other thing I recommend is that you use a REVOLVER and not a semi-auto with a magazine clip, like a 1911.
This is because as both men and women age, our hands weaken for whatever reasons. A revolver is just a trigger pull, and so MUCH simpler to load, etc and think about in an emergency situation.
You just pull the trigger; in an auto there is at least ONE step before you can get the trigger to work (take off the safety - which isn't easy on a woman's older hands on many semi- auto guns).
Another thing that rarely happens with a revolver is they don't jam easily. Semi-autos do at times jam and a woman's hands and a novice has to remember several steps before you can figure out and UNJAM a semi-auto before then be able to do the most important steps: aim well and pull the trigger You don't want a jam in a shoot to protect situation.
Agree with someone else on here that when you get the gun: use it at least once a week or every other week until you feel comfortable. It can be less dangerous than using a car when you get used to it and know the gun.
It takes more time to feel comfortable behind a gun due to: hysteria stories from the "we need more laws" groups.
IMO: We need more accurate knowledge and less hysteria + less violent video games twisting half formed male brains.
Depends if they are singing off key.