@Darnell J.
I'm not going to lie and say I didn't dip into the reserves a few times when I was short on cash to close. I don't like doing it and always replenish the reserves right after closing, but it has happened. I've never completely used them all up and I wouldn't recommend that. I think as long as all of your properties are cash flow positive and you have a personal emergency fund and good income from other sources, you will be ok if this happens sometimes.
@Jenelle H.
I don't believe in market timing, so no I would not recommend waiting. You don't know how long you're going to wait for. It could be 6 months, it could be 6 years. It could be forever. I'm a big believer in starting now, even though you may think it's not the best time (it never really is). In the perspective of 10-20+ years it will not matter much where the market was when you started, but every year you delay, you're missing out on huge returns down the line.
As far as income/savings - I think there are two possibilities here. One would be to focus on switching career paths and increasing your savings rate. I went from earning about $40k as enlisted in the US Navy to $150k+ in about 5 years time. Not saying everybody should do it, but it's just an example of what's possible.
Another option is to really educate yourself and embrace creative financing. I'm not an expert on this, so I can't really tell you which "method" works best, but there are creative ways you can buy properties with very little or no cash of your own. This can help you get started while your income/savings are low.
@Sebastien Hitier
I think our high savings rate can more be contributed to having no kids and no expensive hobbies. We pay very low percentage of income tax (because of real estate, businesses, and other deductions) and have mostly 100% employer-paid health insurance.